There's also this option if you want to save a little bit of money and don't need a DVD drive: http://www.newegg.com/Product/Product.aspx?Item=N82E16856173001
As far as I know the ION2 doesn't give much improvements. The D525 is slightly faster and has DDR3 support but I don't think the latter does much. Also don't forget that Bluray and Linux is a no-go.
One thing I'm wondering is how an install works for devices like these when there's only one NIC.