Most of the rifles coming down the pipes have been good ones, though I've seen several reports of problems with things like short stroking, and extractors not staying put. Stainless steel barrels seem to be a bit rougher (and "stickier") these days and sometimes take a some polishing of the chamber to get the rifle to function reliably. Chances are, you'll get a good one... if not, send it back.
What type of shooting are you planning on doing? If you want to shoot matches, get either a NM/supermatch rifle or get a standard and have an armorer rebuild it to NM spec. There's plenty of armorers who can build you a NM rifle for cheaper and better than you can get directly from SA Inc. If you get the loaded and upgrade it to NM, you'll spend more money in the long run.
If plinking or whatnot is more your style, then look at the standard or loaded models. Loaded may or may not be a little more accurate than the standard--without the gunsmithing, you won't see most of the benefits of the match barrel. Keep in mind that the chrome lined USGI barrel on the standard will shoot well to 10,000+ rounds. The match barrel may shoot better initially, but will start to degrade at 4,000-5,000 rounds (although you will get more mileage out of it unless you're a Master category shooter).
Either way, I would encourage you to get a match trigger--either out of the box, or send it out to have an armorer tune it for $40. It'll be the best money you'll spend on the rifle.
Ty