Swingline 444 or 747 are classics and work well.
Buy two and return the one doesn't tack 20 pages on the first try.
Bostitch is good, but I don't know any model names.
The ones with a cast metal base and/or arm are usually better.
Also, do not underestimate the value of quality staples; I AM SERIOUS.
A good 50% of all stapler problems I ever had were from cheap staples.
The staples should be chisel-tipped and SHARP.
Avoid wimpy "wire" staples (leave that to copiers), cheap 'no-name' and house brands.
Swingline 'Premium' S.F.4 is a good all-around choice.
If you routinely have to staple documents of 30-100 pages, get the Etona cartridge staplers, they seem flimsy at first (plastic, bleah), but they work surprisingly well.
If you're ready for something different, I cannot recommend the Rapid "Classic 1" plier-style staplers enough.
Buy 'em here:http://www.johnsonstapler.com
and you can get great service on them as well (they ARE worth repairing...).
Holy crap, I just realized what a stapler geek I am... hold me up I'm feeling dizzy...