i hate gixxers, but thats because i dont like how the feel, very good bikes, but i prefer the others...
gixxerforums.com i think its called is awesome for gixxers.
if your looking at a RR, 600rr.net, is my stompign grounds... best site ever.
for the older cbr's try cbrworld.com and some others....

this is how i do it... new vehicle enter google.. then type "vehicle name" forums ... search... scan the 1st 3 sometimes more, read a couple threads, see how its organised, see if the post sound like kids, or more mature...
is it about stunting racing or both... then i pick the best one... and no matter where you go, use the search function, cause your not the 1st and u wont be the last bike n00b.