Well, you are not going to get stock width aftermarket a arms. It's +2 or +3, and that is it. Shee shocks are good upgrades (from what I hear). But, look around and you can find a good set of WORKS for a very good price. Many guys are running FullFlight a arms, and have no complaints. They sell for about $350 for the set, with tie rods. I've never seen or used them, so I can't comment on their quality.
After market arms are much better then the stockers these bike have. Heim joints for the mounts (usually), heim style balljoints, 12 points of alignment adjustability, and are muck stronger. They also ALL have replacable balljoinits, which the crappy stockers don't. And, if I'm not mistaken, FullFlight arms come with a lifetiime warrenty.