Attached Link: http://www.renderosity.com/messages.ez?Form.ShowMessage=1657380

If you're going for the most "bang-for-the-buck" I would recommend the AMD upgrade. Athlons usually smoke equivilent Pentiums as far as rendering times, just ask shadowdragonlord! Here's a Bryce "benchmark" test that a bunch of us tried some time ago. Check out how the AMD based machines did compared to Pentiums.