Do a google search for;
-Paul Whitby's tank (600gal 96x48x30 with four TEK fixtures)
-Szymon Jankowski’s tank (206gal 64x31x24 with 10-bulb ATI powermodule)
These were two past TOTMs elsewhere, and very nice tanks too. A good T5ho fixture will allow you to keep whatever you want.
I don't have any decent pics, but IME I've been able to get colors out of SPS under T5 that I have not seen under halides. Best example is pink birdsnest. No complaints with color or growth.
I would not put sps under pc lights. If they live at all they will be brown and barely grow. If you do, make sure they are lower light sps. I have seen some beautiful acros under T5's. Much nicer than I can do under MH, but I am somwhat new to sps (new to success anyway).
definitely doable. I prefer the look of MH, but sometimes I do get jealous of the ability T5 users have in having a variety of bulbs to get the colors to look great. Sometimes its too washed or pastel looking, but sometimes the colors are just amazing.
I used to run halides until I went T5 and I will never go back.
Here are some shots of mine under 6 bulbs over my 75g....
Better light coverage for the watts used and less light. Unbelievable par if you get the right bulbs too. Plus you can change the color of your tank by changing one bulb at times depending on your setup!!!!