According some benches (i don't know if it's legit or not) on the internet, 780i performance aren't any better than 680i or X38. Atm, P35 is the best chipset, if not you can always choose 680i.
I wasn't going for the speed I was more interest in features. I don't know really I may just go for a 680i as intel are changing the sockets next year anyway so prob PCI-E 2.0 would really take hold till then anyway.