Is there an affiliated club in your area you can join? If so, often they have deals with the mfg's and you can buy whatever brand the the club is setup with (BM, RRA) and save a bundle. Like hundreds of dollars bundle. More than enough to offset your cost for joining the club, plus you get to use their facilities, get instruction from seasoned shooters, etc.
If that's not an option, if you have a spare lower sitting around, I'd go with a WOA upper and get yourself a Holliger-tuned RRA trigger and slap that in there. Some guys like to get the pinned rear sight mod as well, it may not be a necessity but it would offer some peace of mind while you're learning. You can get all this for around $800-900 or so and you'll be set.
I wouldn't spring for a high end barrel just yet. Get into the sport, learn to shoot, and then when your original barrel craps out, spring for a Krieger or whatever, or get a 2nd upper with a Krieger and use the original upper for practice, reduced course evnts, etc.