Another US host recommendation I'm afraid, but I use asmallorange.com and have had nothing but amazing service.
Note: Their customer-to-customer forum does have a fair few real amateurs on it now (it used to be just people with CLUE) however with the growth in customers the tech support team are expanding continually to match it and they know what they are talking about.
Often owner Tim Dor is online answering any queries and tickets too, personally I think they are a friendly bunch and very keen to help people.
You can have unlimited domains and sites on any of the shared hosting packages, even the tiny one for 25USD a YEAR.
[ If you do buy, my affy link is:
A Small Orange ]
Also they do have two coupon discount levels,
orange15 gets you 15% off an order and
orange5 gets you a fixed 5 USD off - which is actually slightly better for those of us for whom the tiny plan is more than enough.
Feel free not to use affy link or thouse coupons (which I would also earn on), as my review above is based upon happy service, not commission, etc.