Go with a quality tool. If you are looking on the cheaper side and don't need a whole lot of adjust-ability the Park ATD-1 adjustable torque driver does most of the small stuff I need. It may not be the absolute highest quality but it is way further ahead then any of the cheap stuff on Amazon, Harbor Freight, eBay, or similar cheap-o sites or from lesser known manufacturers or lower cost manufacturers. If I am looking for something of good quality I would probably go either Effetto Mariposa Guistaforza or the Topeak Digital Torque wrench or Snap-On. A torque wrench is probably not a spot I want to save money, yes it is an expensive tool but it does an expensive job or maybe better said is it saves you from big expenses. I might save money on a tool I would rarely need or use but a torque wrench not so much. With today's modern components made of lightweight materials proper torque is important.

Whenever I adjust the seatpost height on a carbon bike I always always always pull out a torque wrench because CRACK KILLS!