My current host has been very good to me but unfortunately, my site is growing and I cannot afford the bigger packages my current host offers.

I've been scouring and following both the 'shared' and 'reseller' forums for the past few weeks and have come down to a point where I need to choose.

(Please, I am not looking for hosting offers)

Before I continue, I am wondering if I should go the shared or reselling route if I have multiple domains? Should I go with a multiple shared hosting plan or go with resell?

At this point, my requirements are 500 MB with about 20GB bandwith and I am willing to spend $15-$20 a month (nothing more).

I am only considering the hosts that seem to have happy customers and reputation and they are as follows:
(I've ruled out "pair", "httpme", and "unitedhosting" because they're out of my budget range)
- Bluewho
- Dathorn
- p4host
- Crediblehost
- Lunarpages
- Rochen
- Cirtexhosting
- UltraUnix

If you have any experience with these hosts, I'd like to hear from you...I'm more concerned with their support, speed, and uptime and not so much other things as I can search the forums.

IMO, most of the providers will have the similar uptime and speed as web host providers in WHT are mostly located in the several major DCs, eg. burstnet, servermatrix, ev1, dedicatednow, gnax as well as FDC. The only factor that determine differences in uptime could be their server management and extend of overselling (at your price range, most of them does).

In your list, I can recommend P4HOST and CREDIBLEHOST.

LUNARPAGES is a good option if you want to use JSP as well :)

You can visit the forums of the companies you are interested in to have a "birds-eye-view" of their operation.

Of course ,that would only apply if they have customer forums. :)