Tools: torque wrench

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I have 3 that cover just about everything. I got them at Sears. The littlest one gets used 90% of the time. It is very important to use a wrench so it is in the middle of its range. If you go towards the extreme ends of its range the accuracy falls off. Mine are "clicker" types. The ones you listed are "beam" types. The beam style is nice because they work in both directions and they are easy to calibrate. The ones I got from Sears cost maybe $70 each plus maybe $5 each for the cases. One other thing about clicker style wrenches is you have to return them to their lowest value when they are not in use. You get used to this and it becomes second nature after a while. If you have any more questions let me know.

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The big one is only used for cassettes (37ftlb) and my truck's wheel lugs (150ftlb!).

I could easily get by with just the small one, although the middle one is nice for pedals and crankarms.

For normal use something that covers 2-10ftlb (24-120inlb) will do most of a bike. Most of the fasteners I torque are 4 or 5ftlb. (I round up to the nearest ftlb to simplify things. Like my cleats ask for 45inlb so I round up to 48inlb.)

I keep a list of every fastener on the bike and the appropriate torque value. The only items that are not torqued are cable ends, dérailleur pulleys and the front dérailleur clamp. For those I just use the small end of the hex wrench as hard as I can, which given the small leverage, is not very much. Maybe between 1-2ftlb at most.