Interesting. When I look at Music Hall's site, the Tracker looks like a Goldring Elektra and the blue OM10 is called the Magic 2.
http://musichallaudio.com/magic-2-cartridge/
http://musichallaudio.com/tracker-cartridge/
Glad to hear you're feeling good about the purchase. If you have that blue OM10, a significant upgrade, at least on a friend's Rega P1, is moving to the Ortofon Stylus 20. His stock cartridge was the OM5E, but he first upgraded to the Stylus 10, used a Rega Bias for a few years, then went back to the stock cartridge with a Stylus 20. That proved to be the best sound yet, and is what he's been using for about the last 5 years (with his usage, he's replacing the stylus every two years). I wouldn't ditch the stock stylus til it's worn out, though, because that should sound good, too. Let us know if it changes perceptibly after a break in period. I don't know about the one you have, but Ortofon suggests about 20 hours for their DJ models.