Honestly, I think a replacement fork might be costly and it wouldn't necessarily turn the Quick into a better ride than it is.

On the other hand, you could get a second hand Cannondale hardtail for an acceptable sum of money. I see decent deals all the time on Pinkbike and ebay, you could really take advantage of that if you're from the US. I love Cannondale's proprietary Fatty and Lefty forks, but you can also find them with more regular forks such as Rock Shox Recon.