Here's a synopsis of what I did:
I had some nagging questions and wanted to be safe and within code, I bought the 2008 version of the Ugly's Electrical Reference from HD (very informative), used the tables and formulas to find that 1/0 would give me a voltage drop of 3% or less (barely), and ended up doing the following:
For the two Hots and the Neutral I bought 870 feet of "2/0 Southwire SimPul" with THHN/THWN-2/MTW rating and had them cut it and roll it on three seperate reels (290 feet each @ $1.31 a foot - great price, most places wanted $1.70 a foot or more!).
For the Ground I bought another 290 feet of "#4 Southwire SimPul" with the same rating @ $0.61 cents a foot and put it on its own reel.
The following information is for those that have never pulled longs runs of wire:
I used a shop vac to **** light-weight string attached to a wadded up Walmart bag through the 2" conduit (took about 5 seconds - cool!). I then tied a rope to the string and pulled it through.
I stripped back the insulation on the wires about 6 or 8 inches, cut all but about 7 or 8 strands and weaved a loop at the end and then wrapped electrical tape over the weave so that it wouldn't cause any damage to other wires or conduit when pulled.
The rope was small in diameter so I pulled each wire through the conduit seperately; all four at once would have put an enormous strain on it. The pulling was actually easy because the wire was "SimPul" (very slick), the run was straight with only two 36" sweeps, and most importantly, because I used a Polaris Razor S to do the pulling while my brother inlaw fed the wire into the conduit on the opposite end.