For de/buffs and cooldowns:
Fortexorcist
Raven
For cooldowns:
CoolLine - As mentioned.
In actionbars:
OmniCC Or
tullaCoolDownCount(tulla is the lightweight version)
I've used each one at least twice and found them quite nice but not matching my needs, perhaps you'll find one that matches yours. Personally, I use tullaCC and Forte due to the light form tullaCC has and the customizable interface of Forte.