+1 for finding the nearby Co-op, and doing the work yourself. If you are sold on doing the chain, then I would look at changing out the freewheel, it would be a good idea to get it replaced at the same time. A good bottom bracket can be had at near, or at the same prices, as listed above, get as good as you can afford to buy, if you are doing the labor yourself, there is no extra cost involved for that part.

Even though you have a Co-op nearby get a good maintenance manual, like Park Tool's, "Big Blue Book", or Lennard Zinn's, "Zen and the Art of Road Bike Maintenance", they will be great for anything that stumps you when you aren't at the Co-op. All of the advice given was pretty darn good, typical for here.

The 3.0 frame sets are good, reliable units, you are doing the right thing in keeping it and replacing what needs replacing yourself. You won't regret doing it.

Bill