Closeout deals on a Manitou Black Comp all over the place for right around $200.
I'd also look at a Rock Shox Psylo with U-Turn Travel adjust.
Of course, my favorite fork (and the one I own) would be Marzocchi Z1. I just bought mine on closeout and paid $299. It's a bit more travel than what you want (5"), but a great fork. I bought mine at Cambria Bicycle.
See if they still have some left over.
Also, regardless of which fork you buy, you WILL need to change the stock springs to a stiffer (the stiffest) spring.
You're over 200 lbs, so you'll need the X-Tra Stiff!
L8R
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