Change the CPU to a 2500K, they're about $100 less than the 2600, with all of the benefits for gaming and general use.
For a motherboard, since I don't know whats available in your country (or what country it is) I'd suggest one of these if you can find them:
Asus P8Z68-V/Gen3 -or- Asus P8P67 Pro
MSI Z68A-GD55 (G3) -or- MSI P67A-G45 (B3)
Power supply, again don't know whats available in your country, but generally best to stick to these brands:
Corsair, Antec, Seasonic, Silverstone, OCZ