The 2nd generation Core processors may be worth a look: 
 
Intel BOXDH67CFB3 - $129.99 mini-ITX H67 Motherboard 
 
Intel Core i3-2100T 35W 2nd Gen Core i3  
A better performance 35W model does exist, but I can't find that one in stock anywhere. 
 
This should be a fairly cool running machine, with a good amount of performance. For virtualization purposes the i3-2100T does have VT-x, but not VT-d.