James,
Welcome to the asylum! First I got hooked on djembe, then went to a Cuban party after a djembe class, the next thing you know I've got claves, congas, and bongos, not to mention dunun. The damn things breed!
Anyway, as with djembe, I am no expert, but I did discover a site similar to djembefola, but with a very active "for sale" section. The instruments there tend to be very high-end ($300 - $600US for a pair of bongos), but there's lots of good information and you can get a feel for what the community thinks is good and not so good. The general advice is stay away from entry level bongos (e.g. LP Aspire). The top of the line Meinl's seem to get good press, aren't that expensive, and may be easier to find in Europe than the US brands. LP Giovanni and Valje, as well as GonBops California series also seem to get good press.
Here's the link:
http://www.mycongaplace.com/forum/eng/I ended up finding a pair of GonBops Tumbao bongos on eBay for a reasonable price. They are decent drums--definitely not hand crafted, but can generate good tones. Not sure if you have CraigsList or equivalent in France, but that's not a bad source once you figure out what you're looking for.
Evan