Well im one of the few guys that still have love for the ol proaction skid. I know it aint the best but it is what it is. If you fix it, set it up right and give it a little love it will work just fine for ya. The way i see it is no mater what you buy for another skid it also will have to be rebuilt, shocks rebuilt and then installed. If you dont know what your doing or have a good feel for it installing a new skid can be hard. So if you break it down it goes about like this. That bearing just spun out of the boggie so that boggie is still probably good just bang out outer race and replace with new couple bucks. If boggie is junk just hit the guys up here, $10 at most and while at it get 2 and do the 4th wheel kit. So i would the bang out the shaft cause those are just spacers you wrecked by the looks of the pics. So also hit the guys up for new spacers. Then take whole skid apart and give it the BTV tx
http://www.totallyamaha.net/forums/showthread.php?30541-Rear-Skid-Fix-Long. This will fix up that skid real nice. If you need new bushings (you will) rich sells them and he is a sponsor for $49 for everything
http://www.richmotorsports.com/store/index.php . Well worth it as buying piece meal will be too much and why not just do them all while your at it. Then set up you skid per BTV
http://www.totallyamaha.net/forums/showthread.php?34503-setting-up-your-suspension. He knows his stuff. Also if you can swing it send all four shocks out to pioneer (also a site sponsor)
http://pioneerperformance.net/store/page8.html for rebuild and revalve. $179 for all four and they do a awesome and quick job. Have done all my vipers with them. THis skid will ride like a magic carpet after that compared to the old one. Granted it might not be a mono or m10 but compared to your old it will be. So with new bogies and spacers your at let say $30, new bushings $50, coffee can free. SO for $80 your back riding in style. Add another $200 for shocks (adding shipping) and your really riding nice. So for under $300 your good to go. You will spend $300-400 and still have to put money into a skid. Just another option for ya.