I know nothing about the preformance with your two applications but Premiere the six cores win. But I would guess that in the long term the 2011 pin chip/motherboard would have a longer useful life (upgradeability).than the 1155 pin chip and motherboard..
6 cores...and 2011 socket will outlive 1155. Upgradeability. Plus...you can overclock the 3930k was past the 3.5 Ghz on most motherboards with one setting. There is no question as to what you should do.
For Lightroom and Photoshop the i7-3770K will do fine. It also is much more affordable than a i7-3930K on 2011 platform, but at the same time much more limited for the future, because of the limited PCI-e lanes on the 1155 platform. The Ivy Bridge has another distinct disadvantage, the Intel supplied thermal paste is lousy, so it runs very, very hot.
In another place, http://ppbm7.com/index.php/cooling?showall=&start=4 I said:
Warning: If you are considering a much better affordable system, based on the Ivy Bridge processor, be warned that the cooling paste Intel uses on the Ivy Bridge is no good, especially when overclocking. At stock speed the i7-3770K runs 11 degrees hotter than with Liquid Ultra cooling paste and at 4.6GHz even 20 degrees centigrade. However if you change the cooling paste, you also void the warranty.
To summarize: the 2011 platform has a better perspective for the future but at a price.
My suggestion is to not ignore drives. While I'm not a Lightroom user, I can vouch that Photoshop batching and Bridge performance seriously benefits from a large RAID. If you don't have enough read/write capability to keep up with your CPU, then the full benefit of either very fast CPU choice will be cut short.
Also, get a GPU with good memory bandwidth if you care about browse speed from photo to photo. Good old 2D video performance (pixels to display) is required.
Thank you all very much for your advice, I have decided on the 3930K and I have decided against RAID 1 for back up and have chosen some fast hard drives for a RAID 0 array to increase speed.
Hi, can you tell me how you are doing with your machine please? Has it worked ok for LR and what MB did you end up getting it with? Are the Noise sliders for luminance and detail reactive/lagless on images that have a shadow or highlight setting set in the Basic panel?