[6.1]Vantage Server design

I'm putting together specs for a new Dell Server and trying to be as
economical as possible but still get processing power for the future. We're
on 6.1 and have no plans to upgrade. Current Db size is 1.2 Gb

Any recommendations for 1 vs. 2 processors, dual vs. quad core, faster
speed, or faster bus. The most economical is 2 Dual Core Intel® Xeon® 5110,
4MB Cache, 1.60GHz, 1066MHz FSB, whereas the most expensive is a single Dual
Core Intel® Xeon® 5160, 4MB Cache, 3.00GHz, 1333MHz FSB.

Norm Watkins
Engineering Mgr.