Opinion Needed: Lighting Purchase

[Funkytone]

Hi Everyone,

I have a 75g with a bunch of softies right now and want to make the switch from PC over to MH. I've got the opportunity to purchase the following but just wanted to get your opinion if this is adequate for my setup or overkill?

Ice Cap 250w Electronic Ballast
XM 250w 20,000K MH Bulb
Mogul Reflector 175-400w

$200 for all.

Is this too much for my tank?
Will I have to keep everything towards the bottom or top of the tank?
Would I still require the Actinic's PC's?

Any input is appreciated guys.

Thank You
-Tony