There are several different options that I am aware of:
1) Race-tech springs and Gold Seal valve kit. There is a noticable reduction in dive and better control overall with the correct spring (for your weight and riding style) and a re-valve, and the parts should be in the $250 territory (assuming that you do not need seals or other parts).
2) The Ohlins front spring set. Again, a stiffer spring helps but this spring is only available in one rate and may not be ideal for your weight and riding style.
3) Lindemann Engineering can turn your forks into a "poor-mans" copy of the Ohlins Street and Track forks. For about $1060, LE will re-valve, re-spring, reseal, anodize the sliders and coat the tubes with TiN. LE claims that their rebuilt forks are better that "everyone else's", though a comparision in "Roadracing World" (I think) concluded that the Ohlins we still perceptibly better.
Good luck,
Mike