there's a simliar debate going on in this thread
Spirit and upgrading lock gear in WotLK - Page 3 - The Warlocks Den Forums
so I won't repeat what i've said...
just reply to point #2... regardless of what raiding level you're at now... there's no individual looks left....
T4 => most are in FSW
T5 => badge gear / ZA items are the norm
T6 => your T6 mixed with gear from the lower tiers.
my warlock doesn't look any different to the other warlocks i raid with that stands 10feet away from me. the only difference is hairstyle sex and race