I've talked to TONS of people who are running the LRP Z28 motor and absolutely love it. I really like OS Engines and would replace just about any nitro engine that I had with an OS, but if I still had my Savage I would buy the LRP just because of how many people that I've talked to that are running it and running it hard, and they all say the same thing, excellent durability, holds a tune pretty good, and lots of power.
Update, when I looked for the OS .32 on ebay, this is what I came up with.
http://cgi.ebay.com/NEW-Black-Vinyl...7913864QQcmdZViewItem?_trksid=p3286.m20.l1116 It's very powerful for it's size, and the funy sounds will be sure to destract fellow racers. When it gets revved up it really screams lol.