What size torque wrench?

I don't know which section to post so here it is!

I want to start working on my car soon and I need a torque wrench. I bought a craftsman with the digital read out that goes from 25-250 ft-lbs. My question is do I only need the one that goes from 5-80 ft-lbs to do everything on our cars. It is only $10 cheaper but it goes in .5 lb incriments and the one I have goes in 2lb incriments and starts at 25 instead of 5. Im thinking the slightly smaller lower lb torque wrench would be more handy and accurate than this one, I plan on doing everything from the heads / trans / rear end. Whats the highest lb-ft I would need on any part of the car?

it isn't very often you need more than 100lbs...

but there are a few things that require 10-15lbs.

so i say the smaller one for that reason, and the smaller increments