Sorry, but your prices are a little, um, high, as are those of just about everyone else around here who has been trying to start their own little reseller business lately...
My hosting right now is $16.95/month - the price would be comparable to your "Plan 4". But I get unlimited space, unlimited b/w, unlimited email accounts (not aliases), and any extra sub/park domains only charge a single-time setup fee, not monthly recurring. Plus all the other features you listed and then some, excellent service & uptime, etc. And I know for a fact that there are other people out there who get similar features to mine for even cheaper than I do.
So you may want to rethink your pricing schedule if you really want to get customers. A very good percentage of people here are on freebie servers anyway, and those who aren't probably get pretty good prices already. You're really going to have to be drastic if you actually want people to switch to your reseller thing.
---Skorpion