Gosh, I wish I was on your tight budget. I can barely afford gas!
The KLX300 hasn't changed since about 1995. Nuff said. And I would stay away from the CRF. I love the Honda bikes but that Unicam engine is giving people nightmares with valve problems.
Especially the 250. Do a little research on the net and you will get
lots of hits. It is an incredibly sweet bike to ride with magic-button and the works. But for some reason after you build up some hours on the engine the valve tolerances become almost impossible to maintain. I know guys who've poured tons of money into that head and it still gives them fits.
For the money, the best Enduro bike out there is the YZ250 (the 2-stroker). A little wide in the gears but it weighs about 110 pounds full of gas. and they can be had relatively cheap. With the money you will save you can have the suspension revalved. Next is probably the WR250F, a good bit heavier but bulletproof and with the free mods, plenty of
torque. Nowhere near as flikable as the YZ and laughable when compared to a trials bike. Yamaha is also going to give you very low maintenance. And the parts, since they are Japanese, don't require you to donate your testicles to science to pay for the stratospheric Euro. The KTMs, GasGas, Husky, and other EuroBikes are incredible machines, but holy crap, if the dollar doesn't quit sinking I'm not going to be able to afford air, either.
My 3 cents.
John
P.S. Don't rule out a late model XR250 or XR400. Change the oil every now and then and the bike will be a pall bearer at
your funeral.