I was thinking the latest AM3 955 quad core chip, but as there arent a good selection of am3 / ddr3 matx so im not sure if it will work well with am2+.
Also if possible id like to have the cpu mobo and ram running at its optimum fbs.
any help will be much appriciated
More aboutmobo combo help
Do not use an nVidia chipset with an AMD processor. If you want an energy efficient build then you shouldnt be looking into a quad core, or if you really must look into some of the energy efficient ones from intel. Is there a particular reason why you are looking into energy efficiency? If you want to do a hybrid graphics solution the AMD 790GX motherboard is capable of it.
The reason i wanted to use the Hybrid power is that i dont want my graphics cards working constantly when not required, it makes my room hot lol