1. +1 on the PRS SE range. Especially check out the SE soapbar /soapbar II - the stock pickups are great sounding. They're discontinued, I think, and I saw one under $400 at GC. awesome cheap guitar.
2. Check ebay for an epiphone "elitist" SG - you may go $50 or so over your price range but it's likely to be a very nice instrument (made in Japan at the matsuwhatsit factory) and very resellable. Gibson pickups on those.
3. bare-bones warmoth tele. GFS pickups help keep the price down, go with no pickguard, finish it when you can afford to. a $5 can of deft spray will give you a very pro finish to a maple neck very easily and satisfy the warranty requirement.
http://www.warmoth.com/showcase/sc_guitar_bodies.cfm?itemNumber=T1115&type=guitar
http://www.warmoth.com/showcase/sc_guitar_necks.cfm?type=guitar&itemNumber=VMT1374&menuItem=4&subMenuItem=2&subMenuItem2=0
That's $300. They'll rout it for two humbuckers no prob, just ask them.
$80 - two GFS buckers or some well-used things from ebay
$100 - random hardware, all quality from Warmoth
$20 - finishing supplies
If you go that rout, stay away from the junk GFS hardware - if it even fits, it's garbage in my experience. I've bought a garbage bridge, jack plate, and pots from them, and the tuners were good but no cheaper than the SG38 from warmoth.