How much experience do you have with bikes, both fixing and riding them? If you know the size you need and you know how to put together parts of a bike then you're probably okay to buy online. Otherwise I'd suggest that you go to your LBS for a proper fitting. You can rely on them for future service and support.

As far as the Contend is concerned, it looks like a very good entry level endurance bike. Disc brakes are nice.