Hi ozzie, I bought a Kona caldera from chain reaction in January. They are great bikes, good kit for the cash. Using it as a winter training bike. Most important is fit, make sure you get a bike that is the right size or you are just throwing your cash away. Try a few out at your local bike shops. If they can’t offer you a deal then have a look on line for a deal.
Canyon are good bikes and come with good spec, but if anything goes wrong you’ll need to sort it yourself. Most big brands , specialised, trek etc will not be able to offer as good a deal, so look at a 2011 spec bike.
Good on line stores, try chain reaction, Evans cycles, wiggle, merlin cycles. In fact Merlin cycles own Malt bikes are very good.
Hope this helps.