There have been several discussions on this forum regarding which type (beam, dial, "click") to use; many if not all choices are matters of personal taste. Inexpensive "click" models which will be quite adequate for bicycle work are available from vendors such as Harbor Freight and Northern Tool for under $20. There are numerous higher-quality and higher-priced choices as well. Search the forums and make a choice but get one and use it. You will probably need two, actually; a lower-torque one in 1/4" drive and a higher-range one in 3/8" or 1/2" drive for bottom brackets and the like. If I had to choose I would get the smaller one first as you are less likely to damage a larger fastener by overtorquing.