As I stated in my last sentence in my original reply "I know this doesn't help you a lot when compared to the 350xc, but what I can tell you is that you will not be disappointed with the KX450.". I was merely stating that the KX is a great bike.
I am fully aware of the differences between the SXF and the XCF. The SXF will be a better snowbike than the XCF for several reasons, but will not be as good in the woods as an XCF. I buy first for the snow and second for the dirt... snow is most important and I can make the bike suit my purposes in the dirt. While it is true that both are supercross bikes, the KX was awesome in the woods. Sure, it's no 300 XC 2 smoker, but the Kawi was VERY good and I think you would be surprised if you rode it how I had it setup. And to me the KX far surpasses the SXF in the woods... you can call me ridiculous all you like but that is the truth for me.
Sorry for the hijack... like I said, the KX is great.