captainredbeard, first of all, welcome to the Boards! I've only got a few minutes to post this afternoon, so will try to add a bit to the advice the others have given.
First of all, as you're "stopping over in Hong Kong I assume you're travelling from Australia? It helps us a bit to know where you're from, so that we can "tailor" the information more specifically to your situation.
I don't have a lot of information regarding the prices in Hong Kong, so not sure what to advise on that? However, a couple of points to think about: if you purchase the Camera in Hong Kong, will there be any "warranty issues" if you have problems, either in Europe or after you get home? Secondly, the Charger will probably be a "world charger" (most Canons seem to be supplied with these), however the plug attached to the unit might be configured for HK so you will probably need Adapters to use this in Europe and possibly also back home.
As Muvver indicated, generally speaking Cameras and other electronic products are generally more expensive in Europe than in North American or other parts of the world (especially in the U.K.!!!). If you were to purchase in the U.K., I believe you'd be able to escape the dreaded VAT, however you might have to pay this initially and then request a refund as a "non resident"?
As far as whether or not you should buy a dSLR, that's a difficult question to answer without knowing a bit more about your photographic needs and what you hope to accomplish with the Camera. The main advantage of using a dSLR is the flexibility offered by having interchangeable Lenses. However, with that comes the need to buy additional "glass" which can increase the initial purchase price quite substiantially depending on which lens(es) you select. Of course, you will also need extra Memory Cards, extra Batteries, a good quality Case and perhaps an external Flash unit. One final but very important factor that you'll need to consider is the need to clean the Sensor occasionally. The frequency of this will vary depending on conditions in your location (ie: dusty) and how often you change lenses. Check out Visible Dust, Copperhill method or other sites for a better explanation of this. The need to clean the sensor can be reduced by turning the Camera "off" when you pop the lens off (the sensor is a "charge coupled device" and tends to act as a magnet for dust particles - if it's powered off, there is much less of this effect).
You might find that a "monster zoom" Camera such as the new Canon S3-IS might also fit your needs quite well. This is the recently released successor to the S2-IS and the recent review at
www.dpreview.com gave this the coveted "Highly Recommended" rating! It doesn't have the flexibility or capabilities of a dSLR, but the cost is less and it provides the ability to shoot Video, which most dSLR's are not capable of.
I'm most familiar with Canon models, so that's what I tend to recommend. I believe Tony uses Nikon so he could provide more information on those. I use a Digital Rebel XT myself and so far have been very pleased with it (although I haven't had a lot of time to become thoroughly familiar with it, due to a variety of circumstances). There have been VERY "mixed reviews" on the quality of the kit Lens, so you might want to consider something like the 17-85 IS USM in it's place (it also gets mixed reviews, but these generally seem to be more favourable).
Which Camera you buy will no doubt be influenced heavily by your budget. The Rebel XT / 350D (whatever it's called in your area?) is a great Camera and was recently voted the BEST "budget" dSLR in a recent test in Popular Photography magazine. It's small and easy to carry, which is one of the reasons I like it for travel. However, some users complain that the small size makes it difficult to hold properly. That hasn't been my experience. Of course, if one has a large Lens attached, it's not quite so light anymore! The one minor "deficiency" that I didn't like was the small LCD on the back, but that was a trade-off as with a small package like that, I doubt that it's possible to have the large LCD as well as the top display - there simply isn't enough room!
Two other Canon models that have received good reviews are the older 20D (probably discontinued by now?) and the newer 30D; they are both larger and heavier than the Rebel, but built like a Tank!!! The Rebel XT / 350D will probably be replaced this fall (according to rumors), but since you need a Camera now, there's no reason to wait. One could wait forever for the "best" model with all the bells & whistles!
If you're thinking of taking a course and getting more involved in Photography, buying an SLR will provide you with a Camera that you can both use now on your holiday, as well as "grow into" as your abilities improve. Check the reviews for any Cameras you're considering at
www.dpreview.com or
www.steves-digicams.com for further details. You can probably get by on this trip with just a good "walk around" Lens such as the 17-85, and then purchase other Lenses and accessories as funds permit.
Good luck with your decision. If I think of anything else, I'll post another note.
Cheers!!!