I'm actually considering losing my halides and going back to T5's. I'm probably the exception to the rule, but I miss my T5s.
When I had a 55, I had 4 x 54 watt T5's and loved it. Having had PC, VHO, MH and T5, I can say that, IMO, T5's are the way to go.
If you're set on SPS, halides are great. But, be aware that there are several gorgeous SPS tanks being kept with T5's as well.
Good luck!