CDI and Precision Instrument are both excellent. CDI seems to be a little more available, but Precision Instruments is SLIGHTLY more accurate if you compare the spec sheets. I tried to find a 0-300 inch pound dial type torque wrench about a month ago, couldn't find a supplier with Precision Instruments in stock so I ended up buying the CDI. I am VERY happy with my purchase, and I don't think the extra 1% accuracy of the PI would be worth whatever lead time and price increase i would have had to go through to obtain it.
I've heard nothing but good things about the Precision Instruments split beam style torque wrenches, if you are after a more traditional "clicky" type instead of a dial.