What you need basically is:
liverock (a must)
Next step:
skimmer or refugium or both (quite neccessary)
For less algae problems:
RO or RODI (not super neccesary but really helps a lot)
If you have all those 3 things plus maybe some snails, then your tank will probably be algae proof. (unless you're overstock or overfeeding)
I would either get a 400 watter if you have space or a 250w hqi if you are low on space. Personally I think there's no such thing as too much light. It's all about accimating the corals to the light. Even if some corals don't like the light, you can always put them in the shade. It's better to get the best now then having to spend even more money to upgrade later.
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