Amerinoc is an excellent choice for both VPS and dedicated and they have a pretty good price if you pay quarterly. I have 2 VPS with them which we use mainly to test scripts and we use to bang the server to see how much the server can handle and never found any problem while working on a 20-25k visitors a day range, so they probably will be able to handle more.
This being said, I really doubt you'll find a VPS server that can handle around 500k unique visitors a day and work efficiently, you'll really need a dedicated server, specially if you're using scripts
On the other side, Hostgator isn't as good with VPS (and it's pretty expensive for VPS) but has some nice dedicated boxes, not as good as Amerinoc but they're cheaper
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