Why is a 4870X2 in a midrange build? I have a Sapphire 4870 1G and I have yet to play a game that even puts a dent into my frame rates with 4xAF/AA. I haven't played Crysis on it, nor do I plan to (I'm into multiplayer), but my guess is it would still handle it pretty well.
I want to see a series of builds that are based off the initial platform. Say, start out with a Dragon platform minus the Phenom II. Go with a cheap dual-core ($78 for 7750 BE), a single 4870, 4GB of RAM. OC the CPU and 4870 then benchmark the system.
Then with the same basic platform (motherboard, hdd, powersupply, etc) upgrade the CPU to a Phenom II, add another 4870, add some more ram, lets say go from 2x2GB initially and then add another 2GB stick. Same drill, OC, benchmark, G2G.
You could then do this same thing when the next round of Phenoms hit, that are supposed to hit 4GHz, and put the benchmarks side by side and see what kind of performance increases you get.
People don't want to buy a new computer every 3 - 4 years. A series like this would demonstrate a smarter way to design your PC then just setting a budget and getting the best you can for that budget, IMHO.