I just bought the Stubben Roxanne and love it, love it, love it! And so does my horse. Once I found the right stirrup length, it naturally puts me in the best, most secure seat I've every had. Tried an MT and it was horrible - worst saddle I've sat in. Collegiates are nice, fairly reasonable and easy to find used.
You'll find that sitting in a saddle in a shop sans irons is completely different from sitting in it on a horse with irons. I ultimately picked my saddle by having a Stubben fitter come out, fit my horse and then having me ride in about 8 different saddles until I found "the one". SmartPak has a great Test Ride program that lets you actually ride in the saddle on your horse for up to a week before buying. Best part is you don't pay shipping either way so you're out nothing if you get a lemon that you hate. That's how I tried the MT. I highly recommend trying it out.