I have to agree with Rich. Keeping it stock works, and when something breaks or wears out, use it as an opportunity to upgrade. I generally try not to spend a whole lot on a bike because I would hate to have it stolen or damaged. Instead, I just have a whole bunch of bikes!
Besides, bikes are far overpriced. Looking at a cost per pound, it's ridiculous. High-grade alloys sell for maybe a few dollars per lb. The labor and tooling is light and cheap compared to the auto or construction industry. The machining isn't that complex either, especially compared to the tolerances in many other industries. If all bikes were half the price of what they sell for today, the bike industry could still make a good amount per bike and it would start to bring the value more in line with other industries.
Selecting a cheaper model is really more for your money; they typically have the same frame and performance, but that last lb or two of weight reduction costs hundreds...if not thousands. It's much cheaper to cut weight in other areas. And the other hype is that weight matters. There is a lot more to it than just grams, unfortunately, that's one of the only metrics used.
Why is it that the $10,000 tri bike on Ragbrai gets passed by someone on a $500 commuter bike riding self-supported with 30 lbs of gear? It's the engine more than the bike! You can't buy conditioning.
Another example, 1x11 drivetrains. There are less parts, less machining, and less material, so why does it cost more besides hype? If I was to build up a 1x10, I would spend less than buying a 2x10 and it would weigh less (on the standard rating scale of 1 lb makes a big difference...). The 1x11 should follow that cheaper path as well.