Look into Light Emitting Ceramic, we switched from our h.p.s. and m.h. setup and are getting fantastic enough results that we ordered 10 more 630 watt fixtures to go with the 12 we had.
They're less expensive, interchangeable bulbs so you can run full spectrum h.p.s. or m.h. bulbs as needed, they have a much smaller, lighter built in ballast AND cooling fan and they provide as much or more light than traditional fixtures.
That being said, go with what you like best but take a look at other options, you have a good budget from the looks, take your time and do it the way you like best.
Have a great today.