GTX 660 SC vs HD 7870?

[Harajuku]

I'm looking at an EVGA GTX 660 SC (192-bit)and the HIS HD 7870 IceQ (256-bit) and I'll be gaming on a 2560x1440 monitor. Price for both are about equal. Would I be better off with the 660 or the 7870? The 660 is 192-bit and the 7870 is 256-bit so I'm wondering if that'll make a difference.

 

[Platinum Era]

Actually the 660 is faster -> http://www.game-debate.com/gpu/index.php?gid=1252&gid2=1214&compare=geforce-gtx-660-evga-superclocked-edition-vs-radeon-hd-7870-his-iceq-edition
The only problem with the 660 having a smaller memory bus is that you won't be able to have AA, FSAA, MSAA on or really higher. Anti aliasing isn't required at all either way.

 

[Harajuku]

will the smaller memory bus be noticeable since I'm using a x1440 monitor?

 

[Platinum Era]

will the smaller memory bus be noticeable since I'm using a x1440 monitor?

No, the smaller memory bus will only effect your perfromance while using AA