I'd have to say that Fantastico is the best. There are other auto-installers but the price is very good and its a well known brand name.

CSF firewall, rvsitebuilder, rvskins all pretty good

All are reliable.

Panel, addon domains are top level domains (TLD) that you can add to your shared hosting account. Addon domains are by far the best way to save with hosting expenses.

I also support fantastico suggestion

Fantastico is the best for me. It helps one click wordpress installation facility.

I also think so

I think, Fantastico web hosting is ideal for developers who use Fantastico, powerful software for cPanel that creates various add-on scripts. As all scripts can be setup with a couple clicks of the mouse, Fantastico hosting is a dynamic tool even for novices. Installing scripts has never been easier.

CSF firewall, rvsitebuilder, rvskins, Fantastico all are good.