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I use Knownhost for managed VPS and Linode for unmanaged. Both are pretty good.
Knownhost is a bit pricey but for the 5 months I'm with them, I noticed only about 3 hours of down time. My Linode box is located at Fremont, CA and I've been with them for over 2 years. It had several DC issues, each consisting of about 2 hours or so.