Salty Cajun Folks With Electrical Knowledge

[swamp snorkler]

I want to run power to a work shop I built, it's 12'x20'. I'm going to put 4 sets of 4' flouresent lights with 4 bulbs each. I have a 2hp table saw, scroll saw, 1hp band saw, disc sanding station, air compressor, router table, a miter saw station and a table top drill press. Obviously all of that will not be running at the same time, at most possibly the air compressor, lights and another tool. My plan is to tie into my service panel 220 and run it to my workshop through the attic in my house. It's about a 100-125' run. I plan to use a 50 amp breaker and run it to a 110 sub panel then feed off of there. My question is what size wire do I need. Will 6/3 w/ground be enough or should I go to a larger gauge.

Could I use http://www.homedepot.com/p/Southwire...0002/202316279 and run it though conduit for about 8' from my attic to my shed?