for sure, PCI-E. no benefit yet over AGP but it will show in the not too distant future. the DFI is a very good board, for whatever you want to do, and is one of, if not the best 939 overclocking board on the market today. well worth the extra few dollars. and hey, just do the mod on the chipset and wallah you have yourself an ultra D with SLi
all it takes is a pencil, unless they have since disabled the use of that mod in the newer revision boards.
I have a DFI Lanparty UT NF3 250Gb, its obviously not the same as the new NF4 boards, but i have to say DFI as a company make damn good stuff, this board has never given me any trouble, everything is simple and well though out, layout on their boards could not be better
save you and your friend some problems down the track and get the best 939 board you can now, instead of running into trouble with a cheaper less reliable board.