Nice tent for the weight is the Velox 3 dome tent if you can find one. They are just barely out of production.
2 entries, lots of mesh, nice vesibules, good size fly, easy to put up.
Weighs right at 5#
http://www.basegear.com/sierra-designs-velox-3.html
http://www.altrec.com/sierra-designs/velox-3-tent