My only advice is to go with the best possible light set up that you can from the start. If you settle you will be wasting money as you will want to upgrade downt he road. There are benefits and pitfalls on each type of lighting ....
T5's are great and provide good growth etc on all corals provided that you have enough and that each bulb has it's own seperate reflector etc. they don't provide the shimmer effect that metal halide lights will but then they don't put out the heat either and are more economical to run than halides (bulbs are cheaper and they don't use as much power). Halides offer a great shimmer and high intensity light but they are costly, run hot, and usually you need to run supplemental actinics for the blue lighting unless you run high k bulbs. Both of these set ups are costly to start but can be done as a retrofit if you know or are handy......You need to know your heat issues, the types of corals you want to keep in the long run etc.