got a new motherboard - gigabyte ultra durable 3
new ram - 6 gig OCZ gold ddr3 pc3-10666c9 low voltage
new gfx card - nvidia geforce GTX 295 576m 1792MB ddr3 dual gpu dual dvi
new PSU - cooler master real power 1000w
new cpu - intel core i7 920 2.66Ghz overclocked to 3.34Ghz (nehalem)
new heatsink - noctua
new external HDD - 1000gig network nas lan
just now i am currently running windows xp pro
what i would like to know is if i would be better going with windows xp 64 or the new windows 7 as i know both have had software compatibility issues, what would be best for my new set up ?