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I am currently paying $10 a month - no multiple names allowed - $29 is a reasonable figure - I certainly won't need more than 200 domains.
However, the thought occurs to me that you can find some companies offering dedicated hosting for around $50 per month - naturally you would be able to host multiple domains with a dedicated server.
This would be overkill for me - I don't have huge traffic to justify a dedicated server - but it starts to look attractive if you are having to pay out 30-40 dollars for standard hosting.
They have all of what you need, and give you unique IP addresses for each domain.
If you later to decide to expand your business and add alot more domains to your account, you will be glad you went with them.
I've also found their tech support to be awesome -- they have 24/7 support thru phone, email, and irc
And no, I don't work for them :)
I've got a few very small sites on a multi-domain package and while I can still add 2 more domains numerically with plenty of room for them, the bandwidth is only 1 gig a month, which is maxxed out, so I really can't. In fact, before the heavy holiday traffic hits in November I'll probably have to move something or other elsewhere or upgrade.