fyi, I just picked up a new 2008 2.8ghz Octo for $1899 as a repeat business customer at the Apple stores. That's $900 off retail of $2799. You can get a 3.2ghz Octo for $1100 off...so $3599.
You have to go into the apple stores and see what they have in stock or get them to see what other stores have in stock. Talk to the business rep at the store.
hard to beat and much better than the G5 dual 2.3 I was on!!