If money is no object and you really want the best, the only way to go is a dual spectrum setup. One hood with a 600HPS/400MH. The color spectrum is covered as well as it can be.

If you have the choice, I would not recommend using anything other then HID lights for flowering. Using flouro/CFL are fine for cloning and maybe veg but, i recommend a HID for veg as well.

A digital ballast would make the dual spectrum light pretty awesome btw.

So, the best light i can think of is a dual spectrum 600hps/400mh air cooled hood with electronic ballasts. If you want the best it is going to be very difficult to beat that.