First of all, invest in a Haynes Manual for your car. They are inexpensive and should be easy to find. Honda Factory Service manuals are good, but much more expensive.
Why get the manual when you will not be doing the work yourself? To make it easier to tell when a mechanic is feeding you a load of crap. In the manual, there will be maintenance schedules, recommended things to check if something seems amiss, and tolerances for various parts before they need to be replaced (i.e. brake pad thickness).
Also, the manuals come with extensive pictures, so you will be able to recognize parts, and maybe even get the courage to do a few simple things yourself…
For basic repairs:
Oil Change: every 3 months or so and between $20 to $40 depending on the type of oil you put in (dino vs. synthetic)
Tune-up: These vary from place to place - depending on if you need new wires or not. Even with new wires, $175 should be tops. Better is to get a mechanically-abled buddy, buy him the parts (~$65-$85 for plugs and wires), and a few beers afterwards.
Brakes: Take your car to at least 2, prefereably 3 places for a “free” brake inspection. Get them to write down what they say needs to be replaced, what the current measurements are, and how much they want to fix it. Afterwards, take the three estimates and compare them - do they all report the same thing? How close are the current measurements to the recommended minimums listed in the Haynes manual? Then, take your car back to the place you felt most comfortable.
Timing Belt: Replace ahead of time. This is definitely preventative maintenance (is the engine non-interference? doesn’t matter - it could screw something else up). A broken timing belt can really screw up an engine. The good news is, since the engine will be in a million pieces anyways, you can replace a bunch of other parts such as the water pump for basically just the cost of the part. I don’t know what the cost of this repair would be. Approx $500? It is all labour for this one.
Clutch: If you have a manual transmission and the clutch goes, you could be looking at $500 - $700. All for labour. For a clutch repair, I recommend going back to the dealer, but that is just me. You will pay a premium, but I have found it to be worth it.
I will mention again that you should get the Haynes manual and be familiar with it - even if you are not mechanically inclined. A while ago, I posted a story about getting some brake work done on my car that could have ended up costing me a lot more had I not been informed enough to realize that they were either trying to screw me, or were grossly incompetant (the post was lost in the board crash). It might not be an exciting read, but it will save you money and more importantly, give you piece of mind.
Good luck!