Ah, the Glen. I like the look of that track a lot.
What's your budget for SM? You should be warned that there are dudes spending 40 or 50ks a year to run that. It's possible to run with them and maybe even beat them for less, I hear, but 50ks is MX-5 Cup money. Skip Barber MX-5s are about 22k IIRC, so depending on your budget that might be a better deal. But, I'm sure you've thought of all that and I'm preaching to the choir.
I too plan on riding that Mazda ladder as far as I can. This year a kid just like me (19 years old, 1 year of Skip Barber MX-5s) got a free ride in the Playboy MX-5 Cup after being awarded a scholarship at a shoot-out with 7 other drivers, worth about 70k. Then the Playboy prize I think is a ride in SPEED World Challenge touring cars, which is about $250,000. Maybe we'll meet each other at the shootout?
As much as I appreciate the gesture, I will continue believing that the Russell School has taught me much more in a year than I would have learned in 2 or maybe even 3 years on my own, and probably for a lot less money. When I took my first High Performance (not racing school) class at Skip Barber, my first time getting a full sized car on the limit, it only took a few laps on the autocross and even their toughest instructor said I was really good and that he didn't have much to critique, and they all loved me because I was so smooth and consistent. Now, the skid pad, that's a different story... but that's not the point here! Just watch me dominate that Mazdaspeed Challenge!