Components are a tricky thing. Pricier ones are generally quicker, quieter and lighter, but they aren't always more durable, there are tradeoffs on that broad spectrum. That and the high end ones always cost more to replace when they do break. Definitely don't go bargain basement, but top of the line isn't necessary either, there's a lot to be had in that middle ground. Bikes in that $1000-1500 range are spec'd pretty good anymore for the average rider.you get what you pay for. An 800 bike will have crappy everything that needs replaced. a couple of grand will get you a great hardtail with components that work, ie brakes that stop and shifting that shifts. if getting a full suspension, you want to be in the 3500 range.
yes, i like bikes that work and don't brake down on me when i am in the bush.