Creation and Event aint gay clubs!! I was in Creation last night as it so happens, celebrating my 19th birthday. In my opinion Creation is one of the best clubs in Brighton, much better than Honeyclub etc. As for Creation being chavvy, the only fights I have ever gotten into have been in Honey, one of my mates got bottled in there just before xmas.
My reccomendations would be:
Casablanca (always rammed, you WILL have to queue for a long time to get in and then to get served)
Riki Tik's (great little funky bar, good music)
The Standard (handy for the pre-club drinks)
Creation
Zap
Audio (also check out Above Audio, bar upstairs)
The Beach (athough check the night, can be hideously cheesy)