I'm in the two stroke camp for singletrack. They are lighter, easier to ride, and much easier to maintain than 4t. If you're not doing much road work, there is no advantage to 4t. Either TPI or a Lectron carb makes elevation and temperature changes irrelevant.
That said, the 350 is pretty incredible. If the $1000+ valve job doesn't turn you off, it would be a fine choice.
For pure singletrack use I wouldn't choose a WR450. They are heavier than the 300s, and offer no advantage.
The WR250R is a dual sport, not a dirtbike, so it's not a fair comparison to a 450F. The R does have a nearly indestructible engine with car-like maintenance intervals, though.
ride bikes, climb, ski, travel, cook, work to fund former, repeat.
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