Anyway to improve my build?

[sethwilliam]

Intel Core i5-3350P 3.1GHz Quad-Core $164.99
Motherboard Biostar TZ77XE3 ATX LGA1155 $89.99
Memory Corsair XMS3 4GB (2 x 2GB) DDR3-1600 $35.99
Storage Western Digital Caviar Blue 1TB 3.5" 7200RPM $69.98
Video Card Asus GeForce GTX 660 2GB $210.98
Case Cooler Master Elite 430 ATX Mid Tower $39.99
Power Supply Corsair 430W ATX12V $34.99
Optical Drive Lite-On iHAS124-04 DVD/CD Writer


Total: $663

Will be using it mainly for skyrim on ultra and other games. Is there anything I should improve to make it better or lower price? It needs to be good at gaming so I don't want to go over anymore then it is. Maybe a few dollars more but I'm really looking to save money.
But I also want it to be able to be upgraded in the future.
Oh also, the mobi needs to support sli 2cards.
And a quick question.
Someone recommend a mini atx mobo but I don't like them because I think smaller is weaker. I don't know if that is true for these is it?

And last thing. I get this msg on pc part picker.


Compatibility Notes
Biostar TZ77XE3 ATX LGA1155 Motherboard has an onboard USB 3.0 header, but the Cooler Master Elite 430 ATX Mid Tower Case does not have front panel USB 3.0 ports.
(Flag compatibility notes as incorrect.)

 

[Cyanide Reverse]

Smaller motherboards mean they have less slots for expansion and such but they perform the same.

 

[sethwilliam]

What kind of expansion slots? Like PCI and RAM slots?
Could you just buy one that has the ammount you need?

 

[Cyanide Reverse]

What kind of expansion slots? Like PCI and RAM slots?
Could you just buy one that has the ammount you need?

Like PCI express 2.0 and 3.0 for example and yeah you could do that but that would also depend on your case.