ESP is way over-rated. Even their "custom" stuff isn't made in America any more. LTD is junk.
If you want to pay $3000+ for an import ESP that's been beat up on purpose, a la, Hammet 'Relic', be my guest.
Some ESPs are truly nice, but those would be the Custom USA that have been out of production for some time now.
Jackson USA and BC Rich USA smoke ANY current ESP, and most of the ESP New York stuff too.
Carvin is a great custom guitar for production prices. It's also not a year or longer wait if you want something custom. Great guitars at a great price.
I'd rather buy parts from Warmoth and have GMW Guitars build it, or buy one of GMW's guitars over ESP or Ibanez. GMW guitars smoke, and their custom graphics are top notch.
http://www.gmwguitars.com
And if you want expensive, get a McNaught if you want a player, or a PRS if you want a discussion peice.
For the under $600, you can find decent USA Jacksons and Richs for around that price. You should be able to find a used Carvin for half that on ebay.
Just my opinion of course...