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Fatjack Hosting
Been with em for years. Rarely a outage or issue. Support is capable and thorough. They have a couple of staff members very well versed in XOOPS and XOOPS issue as well as for high performance sites. You can get a decent install performance on there 9 buck package. That's what I started out with, but I'm using there VPS now as I outgrew the shared account.
Overall very happy with their service.
http://fatjackhosting.com