Itching between SLI vs a completely new system

scrutinize me or whatever here are my 2 scenarios. i just need opinions. i currently i have a q6600 @ 3.0ghz which is already showing it's age impractically. by impractically i mean most games, which i never thought the pc gaming industry would ever move to, are going CPU bound again. case/s in point are
f1 2010 and shift2 unleashed. for most of us who are into racing games would understand that to in order to properly play seriously, a constant 60fps is a necessity.

i swear when the first nfs shift was released it dissuade me to go the console route as whatever racing title those silly little boxes can offer, the pc already already has a franchise i could remain loyal to. but i digress when shift2 landed on my pc.

i would rant about f1 2010 as well but drivers 270xx sort of fixed the problem.

the rest of my current system: p5kse/4gb DDR2 800/gtx460 768mb(850/1600)/vx450

btw, the prices i will quote are converted prices from the country i come from (philippines) so quoting newegg prices won't help

i'm torn between the 2:
(note: PSU price won't be included as a psu upgrade is in the works, torn between a corsair gs600/tx650 (mind to give me a suggestion on here as well?), which would be my primary upgrade)

A: upgrade to a SLi system, move to ddr2 1066, buy a used gtx460 768, would cost me north of $250.00

b. parts list:

cpu:cpu, Intel Core i5 2500K Unlocked 3.3GHz (Quad Core)
mb: lga1155, ASRock P67 Pro3 B3 (LGA1155) P67, 4*ddr3
ram, G.Skill RipJawsX 4gb(Dual) ddr3-1600 (F3-12800CL9D-4GBXL)
gpu: retain my single gtx460 768

would cost around $430


now option B is a little tricky, i'm only moving to sb once i see how dozer works, most probably by that time (q4 2011?) prices on an SB system would be a bit lower or even higher (again this will depend on how dozer performs, remember the first phenoms against the penryns? we all laughed i know (sans the amd fanboys))

the move to option A is easier, i could have that setup in a month time depending on the availability of used parts.

P.S. don't preach me about power consumption.

gaming @ 1080p.. well, proper gpu bound games tend to disregard the cpu at this resolution. only interested on which will give more performance, a q6600 @3.0ghz with 2 gtx460s or 1 4ghz 2500k with a single gtx460. the independent variable here is shift2. money to be saved can be used on a driving force GT.

OT:and i don't know what happened to EA recently but they are selling their games here cheap, shift2/crysis2 at $30 each. ubisoft even. activision just sucks.