Which is better to play COD6 MW2?

hello all,
i don't know PC very well, but very enthusiastic in gaming! :D
soon i'll buy new PC JUST for gaming, especially my fav, COD6 MW2.
i don't know PC hardware at all, and i never wish buying new PC that's not support COD6 at its best.
so maybe i'll ask many many question, i hope you all guys can give me a hand.
i'll manage to spend $500 without monitor and OS. i have my own 19" LCD.
lately i have these 3 option (i dunno they are compatible or not) :
1. AMD Phenom II X2 555 Black Edition Callisto 3.2GHz 2 x 512KB L2 Cache 6MB L3 Cache Socket AM3
Western digital blue 320gb
MSI R5750-MD1G Radeon HD 5750 1GB 128-bit GDDR5
Venom RX 2Gb
PSU Venom 650w
case Taipan

2. athon II x3 440 Rana 3.0 Ghz 3x512 or x3 445 Rana 3.1 Ghz or x4 620
biostar AM3 A785G3
gigabyte 4850 GV-R485ZL-512H 512Mb 256 bit GDDR3
Geil 4Gb DDR3 1066
Western digital blue 320gb
cooler master PSU 450w

3. core i3 530
gigabyte ga-ep41t-ud3l
digital alliance GTS 250 green 1Gb DDR3
corsair twin 2x2Gb or Patriot PSD 2Gb 1333
western digital caviar black 500Gb 32Mb cache
simbadda + cooler master 500w PSU

from those three, which one supports COD6 at its best?
will there be any crash or bottleneck or else problem?
feel free to correct them if you find any incompatible hardware.
or maybe you have your own suggestion for me.

thank you so much, kindly appreciate all replies in future!
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