It all depends on what the rig is going to be used for. A gaming rig = forget 2011 and go 1155, with the 3570K being the best CPU for the job. Gaming + A
little video editing, rendering, photoshopping etc...= i7 3770K. A
lot of editing, rendering and other tasks which benefit from huge power and hyperthreading is when you should consider 2011 socket, and tbh i'd be tempted to forget about the 3820 as the 3770K can match it's performance and beat it too in quite a lot of benchmarks as seen
here