I would go nf3 and 3000+ winchester if I were building a computer right now. nf4 is likely to have bugs when it's first released and early adopters are going to get nailed by it. I would also go nf3 because agp videocards are still going to be produced for quite some time, and how often does one really upgrade their parts? You buy a 6800 gt or something in that range and you won't need a new videocard for a long time.