REI has a very good summary sheet on tents that you should be able to pick up at any of their stores. In fact, I just got one yesterday. It lists all of the tents they carry, their capacity (# of people), footprint size, dimensions, weight, price, etc. For touring, weight is obviously a big issue. However, from experience using various tents, pay close attention to the height and interior dimensions as the amount of space you have to move around can make a big difference in comfort. Venting is another big issue, depending on where you live and/or ride. I live in the South, so I want a tent with lots of ventilation but a good rain fly. However, someone camping in colder climates might be more concerned about warmth and want less ventilation.

BTW, I have used very cheap and moderately expensive tents. As with anything, you get what you pay for to some degree. However, if you are willing to spend over $100 you can get a very nicely made tent that is somewhat heavy. If can spend over $200, you can get a nicely made tent that is pretty light. Over $300, very light weight.