It really depends on what you're willing to deal with. MH are the best, but they run hot and you may need a chiller to use them. T5's are the next best thing, but it'll cost you in bulbs. If you can get a nice Tek fixture, that'll save you a couple of bucks on a fixture. LEDs would be my third choice, but the good fixtures can be expensive. Also, you might need multiple fixtures to cover your 60" tank. If you want something cheaper, look into the Reef Breeder fixtures.
So it really comes down to electricity, bulb, and fixture cost.