Joeblog - I've looked and used many cameras. I currently use the 5050c from Olympus, which when I brought it I felt it was un-matched for what I wanted it for (underwater as well as macro).
I've looked at the EOS range, and they are well thought of. I am currently looking at upgrading and think it will almost definatly be the Olympus 8080. The prosumer cameras suit me better than the full SLR style, and money is also a factor for me.
dpreview.com is a great source of reviews and information. Its best to take advice from people who have used lots of cameras as opposed to people who sing the praises of the only camera they own, I am sure you know what I mean.
A few things to consider. Personally i'd not buy a camera with propriotry battries, i'd only choose something with AA battries. Most are re-chargable, but when your traveling its good to know you can get AA battries ANYWHERE, where a failed charger, lost cable or damaged battery could spoil the trip a little.
Also check the memory card types, there are big differences in the cost and performance of different types of memory cards. You may get one camera for $300 cheaper and find it will cost $500 more for the memory cards. Also remember the higher the resoultion (mega pixel) the larger the still images will be. My 5mp takes 2mb pics in SHQ compressed.
Also check for white ballance features, this is IMPORTANT for fishtank photos. This is the reason many people can't get good colour reproduction, lens (not letting in enough light is common with lower end digitals) and no white ballance correction (manual) can cause greens to look purple, bules to look lighter and whiters, gold/brown to look red. So being able to correct this on the camera is a must for the blue light range tanks like our reefs.
A remote control or plunger is also important for tripod work. If you are taking photos of static corals you can use the timer, other wise its difficult to take good photos of moving objects as when you press the camera shutter the camera moves, which defeats the point of having the tripod.
Macro and SUPER macro are also good options. Being able to focus within 5cm (closer than normal macro) is a good feature for fishtank work.
Good luck, can't wait to see some pics you generate.
Buying on Ebay can be a great way to save some bucks, most places will overnight so will work in with you over seas adventure.
Pie