People seem interested in the new low-cost Haswell-based Pentium & Celeron chips, but there hasnt been many reviews focusing on these new snappy low-cost chips.
I found this when I was looking to build a mini itx machine for the front room. In the end I went with the Pentium G3420 because it seemed the best bang for buck.
Intel Pentium G3220 3.0GHz 2 54W £38.39
Intel Pentium G3420 3.2GHz 2 54W £44.92
Intel Pentium G3430 3.3GHz 2 54W £65.99
£6 extra for an extra 200mhz then goes up to £21 extra for 100mhz.
Shame they're not unlocked as it runs so cool it would probably have loads of headroom! I don't even bother with having the case fans running.
Paired it with a GTX750.