If you're into doing somewhat DIY, look at this setup I just posted: Semi DIY LED setup on 55g-Home Depot 5000k led bulbs
All in about $90 bucks. Mine is on a 55, but should work just as well on a 75. Also, the LEDs should last for years and use little electricity while giving the water that nice shimmer effect. I also love how my fish and plants look under LEDs.