need upgrade advise help plz :) !!!

[nyioo7@hotmail.com]

hi guys, i'm planning to upgrade my pc and i can't decide wht to choose. ok i can either get core 2 duo E6300 or opteron 1212 , is it worth getting core 2 duo since it beats amd in almost every way. anyone knows if amd's gonna make new cpu tht drive intel out like when athlon 64 came out?? hehe .... anyways..... help me plz thnx

i'll add more later as request

my pc specs.:

AMD Athlon 64 3400+
Asus A8N-SLI32
4 x 512 MB kingston ddr 400
2 x Geforce 6800 GT SLI
Seagate 300 GB SATA