Most decent full suspension bikes have a lockout lever/knob that stops the travel from moving too much, for like hills/flats. The main top brands are Kona, Cannondale, Specialized, Orange, Trek, Marin, Gary Fisher,Scott are all decent makes of bikes. Personally i prefer full suspension bike than a hardtrail one (Only Front Suspension). It really all depends on what terrain you`ll mainly use it for, also some bike shops will sell decent bikes for cheap, like a demo bike/shop window bike. Can always test ride some or google around, once you figure out what type of bike suits you best.