I have to Agree with Iorn Giant
I have been shopping at
www.pcsforeveryone.com
for at least 5 years. Take a look at their Shuttle pc.
www.shuttle.com
I just bought one for Pooh Star. It is about 6 x 7 x 12 inches. Not much room for expansion but for non graphics intensive work it is superb.
If not, then I feel DELL is a good buy.