You should check out the FPV forum here
General consensus is that 2.4Ghz systems are not reccomended for FPV unless you add a substantial booser to them.
Ive just follwed the instructions from Christ Rigotti (http://www.rcgroups.com/forums/showthread.php?t=1247186
) and added a 1W booster to my radio. However thats getting off topic.
Back on topic i just ordered an nVader 600 and can't wait to try it out