My use of DFI above was a typo that I have fixed, sorry. I meant SLI in that context.
Sound advice all here. While researching this topic, I found a thread where Sailor wrote the following:
"SLI/Crossfire will help on 3DMark scores, but will do nothing positive at 1280x1024 resolution. The frame rates will be so high you can't tell the difference between them and a single card. To put in perspective, few people can recognize anthing beyond 60 fps, in fact, some can't recognize differences beyond 30 fps. So if you boost a single card's rate from 90 to 130, does it make any difference? Not to your eyes, at least.
As far as looking two years from now, by then Vista and DX10 will be in place and anything you buy now will be at best old, and at worst, useless. Basic theory is if you don't buy both cards within a three month period, you're wasting your money. Part of that is because in three months, a better single card will come out that beats the old one(s) in SLI. Even the quad SLI is falling behind, as shown by tests that Tom's did, to the newest single cards.
The only time SLI/Crossfire is worth it is if you have a big monitor, using a very high resolution, and you buy both cards at once."
It makes sense to me. I will go for the NF4 board. Let us close off this thread before I look even more like an idiot.
But thanks all for the quick education.