To what extent are you going to rely on your host's support? If the answer is "a lot", then you shouldn't talk about cheap reselling options. But I don't think that Hostgator's reseller deals are cheap.
You can also look into
http://hostww.net/inner.php?id=reseller3&plan=reseller3 with simple reseller setup control panel branding.
http://www.ivhosting.com/ multiple domain reselling plans, free web site templates.
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