This is what I am using ATM.
http://www.wowinterface.com/download...idescreen.html
It is flexible, looks great, and best of all, it does not take up 70% of the screen!!!!
I use this on my Hunter, Warr, and now Druid. And once you find the add ons you need/dont need, it has low memory usage (Mines around 16mb, up to 24 in 25 mans)