The Trek 7000 series models that do NOT have suspension are ideal "all-around" bikes. Suspension is not essential for typical riding on paved roads. Depending on your choice of tires, those bikes can be used for recreation, fitness, commuting, light touring, or even riding on reasonably smooth dirt trails.
Leave something in your budget for a helmet, and front and rear strobe lights. The OnGuard U-locks are excellent. You should also consider replacing the front wheel quick release with a bolted skewer, and using a substantial cable lock to secure both the front wheel and frame. When and where you lock your bike is equally important. Overnight on a public street in a big city or on college campus is not a good idea with any bike worth more than its locks.