The FX6300 would be faster for such things but would consume far more power and there is the possibility of it being OTT,depending on what you are doing. The other aspect is that there no mini-ITX motherboards for socket AM3+ and although you can get mATX motherboards with an IGP such as the following:
http://www.scan.co.uk/products/gigab...vi-d-hdmi-matx
The only thing it is based on an older chipset.
AFAIK,shaithis on here uses the same motherboard with an FX6100 for ESX though.
Also,unless you go Core i5 on the Intel side,the cheaper Intel chips tend to have less support for things like IOMMU,and I get the impression cheaper AMD motherboards are more likely to support it than cheaper Intel ones.