Thanks for all your answers...
I think I'm going to buy an old road bike (Yes, I have some tools).
But, would something like this one do the thing (I'm not talking about the size or the "would it fit me or not"), but I haven't found much about "Senator" bicycle, does it mean that it's a POS (piece of ****) ?

I don't want to buy a Bianchi neither a oldy-walmart bike.

http://jacksonville.craigslist.org/bik/593853347.html