It's funny, but a lot of professionals don't use torque wrenches... they should, but they don't. I have a Sears Craftsman I really like. From what I understand, it's one of the more accurate ones for it's range.
Here's what I got and I like it..
http://www.sears.com/sr....4596000 (http://www.sears.com/sr/product/summary/
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I've used Snap-On and Mac... but honestly you're really just paying for the better quality feel and the ability to get it replaced off the truck. As far as function and accuracy goes... the Craftsman is just fine. I'd have to say my favorite feature is it's ease of use.
As for torque specs... your best be is always the service manual. If you don't have one, you may want to invest in one. If you just need to know the specs for this one project (whatever that may be)... you may want to try your local Nissan dealership. When I worked at one, we didn't have a problem showing them our service manual and would even take it to the copier for a few pages if things were slow. If this is what you intend to do, I suggest you go there in the late afternoon as that's usually the slowest time.
Hope I helped...