You'll likely be looking for an inch-pounds torque wrench, as most of the foot-pounds units won't work reliably at low torque settings. Any torque wrench that has the area you're looking for in the middle of its range will work well. I use them all the time myself, and have three - one little one (inch-pounds), a medium (around 20-100 foot pounds) and a great big bruiser (40-200 foot pounds or more - a meter long!). For any light-torque application (I consider light torque to be under, say, 40 lbs-ft.) I use the inch-pound unit. It's the click-type, which I like the best, as you can both hear and feel when you've reached your torque setting. My current one is a Princess Auto unit, and works perfectly. I looked at Snap On (I have some Snap On tools), but the cost drove me away. IIRC, the low-range units were in the $200-$300 range. Canadian Tire has Mastercraft lifetime warranty models for about half that, and the PI ones are about half the price of Mastercraft. I like high quality tools, but for ones you don't use every day (like a torque wrench, unless you're a mechanic - then it makes sense to sped the extra $, because you make your living with them) a low-to-medium quality one will work just fine.
There will be those that disagree, and say anything less than the finest available isn't acceptable, but I liken that to saying that anything less than an Anschutz is worthless for plinking. To each his own...
As for screwdrivers, I HIGHLY recommend the Chapman Gun Screwdriver set, available at gun shops (comes in a padded, red vinyl-over-steel case). I've had mine for 40 years, have never broken a bit, and have never rounded out a screw head with it. It's paid for itself several times over, due to a complete lack of damage to the guns I've worked on (not to mention $1000 carburetors, etc.!). I have a lot of screwdrivers (I do a lot of mechanics, metal parts fabrication, machining, etc.), but when I have something really crucial to work on (eg. -stuff with screws made of unobtainium), I always use the Chapman set.
