New Rig 2500k + 7850 ?

Hey guys, I am building a second gaming/work rig for my office and I need a little help.



Basically I have a 955BE + HD6870 rig at home that does a pretty decent job (It is Xfire Ready with a Lepa 850W PSU).

I am looking to build a second for my office and possibly upgrading my current rig.

I am thinking a 2500K + HD7850 build, but I am looking for the best performance for my $$ from both.

I will only be purchasing 1 GPU at this time.



I am considering a few options.

OPTION #1 - Build New rig nearly identical to my current one (955+6870). Then later have the option to put the two 6870's in one and upgrade the other with 7850's.

OPTION #2 - Build new rig with 2500k+6870. Then i can eventually have a 955 w/ (2) 6870's and a 2500k w/ (2) 7850's.

OPTION #3 - (Cheap Option) Build new rig without Xfire maybe an i3-2120? + 6870 (from my current system). Then upgrade my 955 rig with a new card.

OPTION #4 - My whole plan is terrible and my TH peers have a totally better option.



Assumption 1 - I see less than 2 fps average over all the games listed from the 955 underclocked @2.9ghz all the way to 4.2ghz, so the single 6870 is my current bottleneck.

Question 1 - Would the 955 become a bottleneck with a 7850? Xfired 6870's? Xfired 7850's?



Assumption 2 - The HD 6870 is the best deal under $200 atm. And the HD 7850 is the best deal under $300 atm.

Question 2 - Is there a better card for the money in my price range?



Any and all help/suggestions would be appreciated.






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Approximate Purchase Date: Within the next week or two.

Budget Range: $700 (Flexible)

System Usage from Most to Least Important: Gaming - Mass Effect 3, WoW, Diablo 3, Witcher 2.

Parts Not Required: No Peripherals Needed. Only the Box.

Preferred Website(s) for Parts: Newegg, Tigerdirect, Amazon, etc

Country: USA

Parts Preferences: AMD, ASUS, WD, Antec

Overclocking: Yes

SLI or Crossfire: Yes

Monitor Resolution: 1920x1080

Additional Comments: Will be at my office mainly used for work. (Web Design, Some mild PHP and Py Coding)