My good buddy bought an 04 new and loves it. I ride the WR450 and found the KTM to be set up more for full moto cross as opposed to trail. Personally I trail ride way more, and for that reason like my WR way better. It's a bit heavier, but lugs really well when you need it to and isn't so hyper that it stalls when you least want it to.
If you like the BMX feel of the KTM, then go for it. The bike is great, and beyond the fact that parts aren't as readily available, you will be totally stoked on out-of-the-box performance.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body. But rather...To skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming... WOW !!!! What a ride!!!!!!"