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I'll add another site to the "good XOOPS host" list :
Linksky Lots of features and unmetered bandwidth, and I've never had a major problem with them.
Very inexpensive - They have hosting plans as low as $5/month. I've hosted a PostNuke site there for years, and I've recommended them to multiple friends and clients. Just installed XOOPS on a LinkSky hosted domain for a client, had no problems (Xoops is available from their cPanel/Fantastico applications).
If you do sign up, specify that you were referred by "hillsidedrive.com" - I'll get a free month
(about $8 value).