I couldn't agree with Mac more in regards to buying a quality tool. I have proudly owned a couple Leathermans, and they have put up with anything I have thrown at them. I would recommend the Leatherman Wave, it's dropped a lot in price since the Charge came out (you can get one for $60-80). You'll find that you don't use all it's features all the time, but over time, you'll need each and every one, and like an SM kit, it's great to have it all.
You mentioned screwdrivers, and that's where the new Wave and Charge models are great, as they have a nice bit exchanger so you can carry 20+ bits with you. As for scissors, they also have those built into the handles. I own the Charge, but that's just because I have to have the best. The Wave/Charge really aren't that much bigger/heavier than the Juice models, but either way, you can't go wrong with the Leatherman name. Just don't buy a cheap $20 tool, because when it matters, you get what you pay for.