Linode for VPS, hands down over the competition. Avoid slicehost like the plague, they're full of promises and no delivery (though to be fair, whenever they make a promise they give themselves anywhere from 6 months to a year to fulfill it, allowing their clientele lots of time to forget they made such promises).

http://linode.com/
http://bit.ly/chTgk9
http://bit.ly/cfC777

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