The S310 gets our vote for reliability, price point and footprint. It's sister model the 2000 is larger, and does print a fraction of a second faster (220mm/sec v 160mm/sec), but in our side by side tests, it is not humanly perceptible.
The S310 is smaller and cheaper. Why pay more for something that takes up more space and is not noticeably faster? We wouldn't either.
Don't forget to stock up on thermal receipt paper when checking out. We carry the very hard to find, much sought after solid core paper. Why solid core? Understand why under our paper supplies section.
Thermal, USB with Auto-Cutter
Power and USB Interface Cable Included