The 6 tent comfortably sleeps 4, and is more than enough space for 2. If you are only 2 people, get the 6. But the 6 is way too small for 6. I would strongly recommend NOT getting the 10 man tent unless you have a family of 6 you want to fit in there, or you camp in the same spot for more than 2 weeks. With camping, go as light as possible, and as easy as possible. The 6 man Coleman I have takes < 8min to put up. If putting up your tent becomes a PITA, you wont go camping very often. When the weather is good, I try go camping every weekend. Light and easy/fast setup is the way to go, trust me on this one. You'll end up using it every weekend!
PS. Paid $60 for my 6 man at Dicks two years back. I regularly see it pop into the $60-$80 range. Beginning of summer now so dont get your hopes up. But if you can be patient, the 6 man at $60 is a GREAT deal.
Thanks! How does this compare to the Lightspeed?