Davidos
I have just built an E4300 basic rig for our offices using an Asus P5B-VM board with integrated graphics.
It has 2Gb Corsair Value PC2 6400 RAM, with 256Mb shared for the X3000 on board graphics.
It's running Vista business and gets graphics scores of 4.8/4.7 so yes, it's fine for aero with onboard graphics.
We also built five others with A64 4200+ CPU's and M2NPV-VM motherboards and again these have onboard Nvidia GeForce 6150 again using 256Mb system memory and these all run Vista business fine.
My honest impression so far is the A64's are faster than the E4300 and they were a few bucks cheaper as the MB and CPU were slightly less.
Also if you decide to go the E4300 route do watch out as some MB's BIOS won't recognise the E4300 unless it is first updated! This doesn't sound like an issue, but it IS, as we didn't have another 775 socket CPU to bung in to flash the BIOS and until our supplier "leant" us one we sat there with a dead system that wouldn't POST, enter BIOS or let us update BIOS.
So beware.
Ridesy