Can you do a sump under the tank? No biggie if not, but they are nice to have for a SW
tank. xtra water volume, place to hide the heater, place to use carbon if needed, etc, etc.
As far as fish, you'll have to first decide if you are going to upgrade lighting for reef. Those 4x65w PCs will give you a few low light pieces you can grow, but with that tank's depth, you might wanna consider T5 or metal halide. T-5's seem to be the lighting of choice these days.
After you decide if yu're doing reef or not, that will determinie which fish you can do.
So, fish or fish and reef?