You forgot to turn PhysX off for your 3DMark runs
But I agree, those were great cards in their day. And eVGA did in fact make the 1GB Akimbo version too.
Sadly, they are identical in every way shape and form to the GTS 250 and 9800GTX. Yes there are some 9800GTX+'s which had a die shrink, and some GTS 250's that had a die shrink. But there were also some that still were on the 65nm die too. That is one thing that REALLY turned me off of Nvidia for a while.
And the I can tell you from experience, the GTX470 isn't honestly MUCH of an upgrade from your SLI'd 8800's. I just came from a single 4890 (slightly worse than your 8800's in SLI), and going to the GTX470 honestly wasn't all that mind blowing other than Folding.