'06 $2400 model was a dual dual-core 2.66 Xeon "Woodcrest." w/ 1GB RAM and a video card (forget which one) w/ 256MB VRAM.
'10 $2400 model is a single quad-core 2.8 Xeon"Nehalem" w/ 3GB RAM and 1TB VRAM
I'm not suggesting the '10 MP is a bargain or even a "good value", it's not, but it's not exactly 2006 specs as you contend. The stock '10 would smoke the '06.
If you go the the MP tech specs @ Apple.com there is a chart w/ the various quad, 6-core, octo, and 12-core base and CTO upgrade configurations.
You can only buy what is available. If you can afford to wait then you don't need a new machine. If you wait long enough you'll be able to get your 2.93 12 core for $2400. It might be 2033, but you'll eventually get it.