If you're not doing something computationally-intensive, a dual-core Intel Sandy Bridge processor (e.g.: Core i3-2310M
or Core i5-25xxM or Core i5-25xxE
) should provide good performance while saving cost and power.
For half of your budget, an AMD Brazos E-350
Fusion-based system might handle your non-gaming tasks.
i7-2600K, H70, P8P67-M Pro, 16 GiB, HD7950, SSD, 3 HD, Blu-ray, X-Fi Ti Pro, Antec P182, S75CF, 3007WFP+2001FP, RK-9000BR, MX518
i5-3570K, GeminII-S524, P8Z77-M Pro, 16 GiB, HD7770, SSD, 2 HD, Blu-ray, InifiniTV4, NSK2480, 55" TV; Asus UX32VD