Let me add to what Don has said. Several of us who are just getting into AirGun Benchrest have contacted Allen Zasadny about having him build us guns. Allen is a Theoben fanatic, dealer and gunsmith who also happens to be one of the top Field Target shooters in the world. He has a reputation for what he is capable of both when in competition, and when bringing Anschutz's, FWB's and Steyrs, or any other gun for that matter, up to their full potential for accuracy, and has competed with most, if not all of these guns at one time or another during his time at the top. You can read all about Allen's reputation by Googling his name, then reading his list of accomplishments.
When I first contacted Allen, I had decided that since I was a rookie, and he was the expert, I would make no requests of him and let him tell me what I needed. There was no doubt in my mind that I was heading toward buying one of those ±$2500.00 guns only to turn around and add another $500.00 to $1000.00 on top of that to have him rework it. Boy, was I ever surprised at what he told me. He was adamant at the fact that the new Theoben MFR, also a PCP gun, which he has reworked will be capable of shooting side-by-side with, if not out-shooting any of those previuosly mentioned guns. And the best part was, the total cost would be less than the base price for any one of those others.
What type of accuracy can be expected out of one of these reworked Theobens you ask? Allen claims that the first group of guns, which are being sent out as I type this, produced 12 shot groups that were the size of a .25 caliber hole, or just over 1/4", @ 35 yards outdoors, meaning that the actual group size measures approximately .075" (.250 - .177 = .073) ...again, that's 12 shots at 35 yards outdoors. Not too shabby I'd say!
There are several top name brands other than Theoben to choose from, all of which are capable of doing everything you will ask of them. As Don said; it is up to you to decide which Class you want to compete in, and how much you are willing to spend to reach your goal.
Dave Shattuck