Replace front single pivot calipers with a dual pivot design. Keep your old brake levers. Nashbar has a steal of a deal on the Shimano 105 front brake, in black, ten bucks. You can also keep your old single pivot rear brakes, after putting on new pads, since most of them have enough power to lock up the wheel and start skidding.

I have replaced most of my Dura Ace, Ultegra, and 105 front brakes with dual pivot models (and saved the old parts). Couldn't bring myself to swap out a Suntour Superbe brake, so it got a new set of pads.