To the OP-
If you do a search you'll find quite a few threads on this topic. Generally, people here seem to prefer the wet/dry vacs made by Emerson. Emerson makes the Craftsman vacs and the Ridgid vacs. They're mostly made in Mexico.
Some people like Vacmaster. They're all Chinese, or at least every one I've seen was made in China.
Some Shop-Vac brand vacs are "assembled in the USA of foreign components" or something like that. The Shop-Vac branded ones seem to have more negative reviews, but that's just my perception.
I recently went with a Stihl (pics/info in
this thread), which is made in Hungary by Nilfisk-Also. I've been pretty happy with it, except it's not great for picking up water, since it's only 5 gallons.
The only thing I'll add is that if picking up water is one of your main uses, you should probably go bigger. I thought I would never need to pickup water, but our newly purchased house gets significant water in the basement, so now I need to be able to **** it up, and the small 5 gallon vac needs to be emptied a lot and isn't great for wet pickup. Even though it's 5 gallons, it will shut off when only 2 or 3 gallons are in the tank.
I'll probably try to get a cheap used 16 gal or so just for picking up water. I have a drain in my basement, so the weight of 5+ gallons of water isn't really a concern.
Just for kicks, here's the Stihl I bought: