You want LGA1150 processors.
To upgrade WoZ, I went with
MSI/H81M-P33
I3-4170 with a 5191 passmark
These are other LGA1150 processors and their passmark scores (higher is better):
I3-4130 @ 3.4Ghz 4803
I3-4150 @ 3.5Ghz 4899 $129 - Newegg
I3-4160 @ 3.6Ghz 5047
I3-4170 @ 3.7Ghz 5191 $58 - Newegg
I5-4430 @ 3.0Ghz 6339
I5-4440 @ 3.1Ghz 6517
I5-4460 @ 3.2GhZ 6720 $149 - Newegg
I5-4570 @ 3.2GhZ 7153
I5-4590 @ 3.3Ghz 7338 $178 - Newegg
WoZ is noticibly snappier with lower loading times after the MB/CPU upgrade, but I don't know where the threshold for Dialed In is to get rid of the video lag. I think the low end of the i5 or the high end of the i3 would be enough.