I'm not sure you can go wrong with either, but the Impact and Lone Peak to me are the top out-of-the-box actions IMO. They work with the BR cases just fine too. Mechanical ejector and swapping bolt heads fills a niche for sure, but I don't have any use for it. Worst case you spend a little more on a new bolt for an Impact vs just the bolt head, and it's swapped quicker.
Saving a couple hundred bucks isn't a drop in the bucket of even just one season of shooting lol. By the time I shoot 5 PRS matches, 5 club matches, pay for my practice range and ammo, I'm in $10k. I forget which shooter it was, maybe Regina, said she spent like $20k one season. Looking at the overall budget for a competitive shooter, trying to save a few cents a shot or savings $100 here or there on "budget" equipment doesn't really help. No one ever regrets using the best equipment...