I think it supports C++ indeed, and NQC is Not Quite C, so it's something that looks like C, but made for the NXT I think.

Ok.

Has someone a NXT 2.0 ? If yes, can you tell me if you had problems with it (like bugs or something (hoping you'll answer no ))

Ok, thanks, but it is too late (my parents already bought it)

No need to have experience. Building with Legos is easy (and I am sure you already had Legos in your hands ) and there is a language for complete noobs (the one I am going to use )

I didn't know that had competitions for adults with these things. It seems they are much more popular than I thought!

I have both a NXT and NXT 2.0.  Personally, I like them for different reasons.  1.0 has more of the longer bards, but doesn't have a color sensor or two touch sensors, which is useful.  Also, 2.0 has several other pieces that 1.0 doesn't have and vice versa.  As for software, my personal favorite is lejos, simply because I can compile and know how to modify the underlying firmware.  As for which robot to get, I would suggest to build robots, I would suggest 2.0, especially if you want them to move about.

Wow games for NXT, I have not even considered that for the NXT 1.0 I bought 5 years ago, actually I have seldom touched it because I didn't know what to do with it besides run some sample programs/tutorials.