i personaly would wait for the new line of processors on jan 9th because there is a rumor that they will be clocked at 4.4ghz stock and be faster than a 5ghz kentsfield, or just do exactly like i did with 3k and go for a system that can handle the change to the processor, a good motherboard that suppors it is the asus m3a79-t deluxe, another thing i would change is you could save some money by instead of going with a tri sli just go for 2 4870 x2's its a nice investment because the card is not utilizing all of it's potential power and it still kicks ass, plus you know that when they activate the crossfire chip instide of them between the 2 cores there will be an amazingly huge performance boost.
my setup
asus m3a79-t motherboard
16g ram gskill
2x 4870x2
ninja 2 heatsink, should have gone with a coolit system
abs monolith case with 2 added ultra kaze fans
sliverstone 1200 watt zues
1tb western digital (i don't need fast startup speeds because i can wait less than a minute)
amd phenom 9950 oc'd to 3ghz
and it runs sweet except for vista home premium
linux and everything else amazingly fast
i have not been able to slow it down at all. crysis at full settings and full anti-aliasing
plus now i can wait untill jan 9th and then get an amazingly good processor that oc's easiely because it is the fx chipset.
happy hunting and happy gaming