>>346496The glass you screw to the front of it makes a bigger difference than all the fancy features the body has. And, the body's the cheap part. Settle on the glass/format you want and budget for that rather than just the body.
A zoom lens that isn't sealed is gonna suck in dust, snow, moisture, etc regardless of how well the body's sealed.
My D90 isn't "sealed" like the D300's are, but I've not had a problem in light rain or snow. I take care of my equipment, but it gets used too.
Pentax makes some nice stuff. Buddy did stunts/sfx for a promo vid for the Pentax K7 cameras: ?v=Vez7qSrZfpc
I was the only one at this race that had both a media pass (shot saturday's snocross race) and a racer's wristband (hill-x and drags on sunday).