do a search on this forum under Howa 1500 and I bet you will not find a single negative post regarding them. They come in all grades, but the grade does not effect the accuracy. Just depends on how "pretty" you want your gun. Also, I would not categorize the 1500 as a Mauser action. It has a lot more similarities to a 700, but is really it's own design to a great degree. The bolt release is up top as opposed to the bottom like a 700. Also, the triggers are very easy to adjust, and have a greater "range" of adjustment on them. It also has the 3 position safety which I really like. My 1500 w/ a 22" barrel shoots 3/8-5/8" groups w/ my reloads. The gun may be capable of better, but the shooter isn't. I've always wanted to put it in a vice and see exactly how tight it really could shoot w/out any movement on part of myself. Overall, I really enjoy the gun, and am extremely pleased w/ its performance.
I have not shot the others, so I can only speak about the Howa.