It's right at your price range, has good reviews, and free shipping! I don't own it . . . yet . . . so I can't give you a personal recommendation . . . yet!
I have a Proform with a lifetime warranty on the motor. I love mine and had it for 2 years now. I love Proforms service so much I just bought their newest elliptical. Look at the warranty's. Look at the weight and functions. The Proforms are the same as the Nordic Tracks at Sears and Dicks if you want to check their reviews.
We just bought this Epic 550 from Costco and it is a good, solid machine. It even has a TV in the console. It is a little more than you wanted to spend though. Epic 550 Treadmill
I have been doing lots of reviews lately because I want one for Christmas lol I think the Sole F63 has great reviews - it's a little more than you wanted to spend. I am considering the Sole F80