I think the cheapest to repair would be the VSR. It's a very simple design, and there are lots of mods to get it shooting 50+yds.
You should look into a Danger Werx B arm if you get the VSR. That part alone boosted my range immensely.
You should look into a Danger Werx B arm if you get the VSR. That part alone boosted my range immensely.