Wanaride, Keep the KDX, it is already paid for so it costs you nothing to keep it. It is a great trail bike but it is not for the track, believe me I have tried, thats why I have 2 bikes. I had the same dilemma back in 2003 and I decided the best bet was just to get the second bike. I could not get enough money for the bike to make it worth while to sell it. It was worth more to me to keep it and have a excellent running and dependable second bike rather than only get a couple thousand for it and then still need to lay down several grand for a new bike. Either way you will have to spend some money on the new bike so just spend a little more. Besides, Trail riding can be pretty rough on a bike as far as bouncing off of rocks and trees and submarining through streams and rivers goes, so keep the trail bike for that discipline and get the MXer to tear up the track. Not to mention if one bike breaks down and is out of commission, at least you wont be, you can always fall back on the other one. So many times I remember missing out on ride because I needed some maintenance on a bike, now I can take the time I need to work on the bike and still not miss much, if any, seat time. You cant go wrong with buying a second bike. Besides 2 bikes are better than one, heck 3 is better than 2! If your in a position to get a second do it. :)