HostDime is an excellent host not only for regular plans but reseller plans as well.

http://www.hostdime.com/reseller.shtml

The support there is excellent. I've rarely had to wait more than a couple hours for a response from their ticketing system. Their forums are an excellent resource where you can get a lot of help and there is a least one of their techs on to answer back within a few minutes.

Here's a great site...click on 'search for reseller hosting plans', you can choose different hosts and compare them by features. It's very detailed.

http://www.findmyhosting.com/reseller-center.htm