I highly recommend the ESP EC-300P. Although they have been discountinued for a little while, you can pick one up for about $300. It's a LP type goldtop, 24.75" scale with 24
fret neck. The pickups are stacked P90's like the P100's so they are hum cancelling. I love the feel of the guitar and the sounds are great, clean or dirty. I've never cared for the both humbuckers on sounds or 2 SC's on, but both P90's on is a killer tone. Again, clean or dirty.
Another guitar which I'm gassing over is the Dillion Extreme Blues. It's a P90 guitar, LP body,
ebony fret board with a beautiful tree of life type vine. The binding and the detail on the headstock is amazing.
2nd hand they fetch $300 to $400 and new, it's $100 over your budget but man, it's nice!