Unique's don't really matter all that much, it mostly depends on how much resources your web site is using up. But since you're posting, I'm guessing that it is very substantial and has become an issue for you.
As for a good managed host check out
http://www.inetu.net
but yes, as fishfreek said it is much more expensive than an unmanaged server. If you were willing to dedicate the time you could get an unmanaged server and simply get all your questions answered online, for free. It's amazing how helpful and knowledgeable some forums can be. Though the response-time on getting those questions answered would not be as quick with a dedicated, paid for, customer suppor line.
Good luck!
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