Budgetting between $400-700. Can anyone recommend a brand they've used or currently use that will survive (atleast) 1yrs use (at 60minsx 5days).

I'm looking on sears.com and dickssportinggoods but can't really decide on which one to purchase

*Reason I wanna do this is to separate cardio from gym time.. I'll be gonig back to school soon and school + full time work =less time for cardio at the gym!)

I'll still be lifting 3days x week @ 30-45mins/workout session (short and intense baby )