IMO, metal halide is the best bet. at least it was for me. i started out thinking id only keep softies. that quickly turned to lps. and now i am concentrating on sps.
id get the most that you can currently afford and it will probably sacve you money down the road with upgrades (ive upgraded 3 times and another one is coming up as soon an my corals get used to my 250 watt halide).
MH will make your sps, lps, and everythign else look nicer also. some especialy low light corals might have to be shaded or off to the side, but even many many "low lighting" corals look better and dobetter under more intense light.