congrats on rooting!!!!
the best apps that are out there really for rooted users are setcpu and titanium. the best parts really are trying out the various custom roms that are out there. check out ref#2 of my sig for the most current and popular roms that are out there.
as far as gb, the only ones that are out are aosp (android open source project) roms. these roms are pure android with no sense built into it. but they do not have 4g and hdmi working. however, they do have betas out that have 4g working.