ultimatebob
Lifer
So... continue supporting your current hardware, buy up D525s if you want, and transition to low powered Pentium Gs or i3s. Heck, you can even underclock them.
Or use a VIA Nano. Those are dual core and actually support 64-bit.
Sadly, the VIA chips make the Atom look fast in comparison.
Sandy Bridge parts are nice, but they cost a LOT more in volume and run hot in comparison to something like an Atom. Good luck finding a cheap way to passively cool them.