Well form the advice I have gotten here, I believe the WR would suit my riding style more, some dunes and smaller jumps, lots of fire road type riding and long distance rides, mainly the areas where the WR shines. It is a 4 stroke with a reliable motor and is a plus because I don't have to mix gas and the KX would really limit the range of my rides as I don't like carrying extra fuel with me. It is fairly heavy but I think I can handle it just fine I just sold my 230 and I really doubt there is that much weight difference between my old CRF230 and this WR450. Thanks for all the advice and by the way if I did MX or shorter rides I would pick the KX but I just can't justify the fuel economy, and another issue is that the only premix oil available in my town is formula 1 (cheap stuff) and would have to drive at least a hour and a half both ways to get some oil, to much hassle.
your jumping from a crf230 to a wr 450 ? get a WR 250 then move up if you feel it necessary, the combo of the weight and power will cause you to hate it.