Well as Tony and Sam mentioned there are some easier to keep corals than others, with that said though I have kept many SPS corals alive and healthy in my small(27gl) and
NO lit tank now for the last two years. I have such varities as:
monti cap
monti digitata
bottle brush acro
milli's
pocillipora
hydnophora
table acro
staghorn acro
seriatopora hystrix
turbinaria
Even though the growth rates of these coral's have not be staggering, they are all healthy and growing. I think consistency is the secret if you want to keep these and other less tolerable corals. My reef's parameters usually stay the same including temp,salinity, PH, Ca, etc....
I think you should have success with keeping these coral's if you can keep thing's consistent.
My old roomate
once had troubles keeping the same coral's as me, and his tank is twice as big, 100 times more lighting, blah blah blah, the trick is keeping your system running good without major fluctuations. You can see some of my growth rates on my webpage in the pic gallery at the link below. As for specie's- why not try some small frags for starters to see which ones like the lighting, current, etc...
Goodluck
