In reply to Danielg: Also,be honest with yourself about your criteria for choosing a bike. Most modern bikes perform well in excess of what the rider demands and really the choice becomes an emotional one. Both how the bike feels and how it looks. A Giant although good value and good reviews wouldn't make my shortlist because it is bland,corporate and soulless. Yet I would spend hours drooling over the likes of Orange,LaPierre, Cotic,Santander Cruz,Norco,Yeti,Ibis,Ratley,Lynsky,Whyte and others - all bikes of soul,beauty,individuality and integrity,with stories behind them and their makers.
You are going to have an intense love affair with your bike,so don't just go on price and performance.