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.