i agree with
nm+ ...
i have a lightweigt 2 man tent, and it gets very cosy even with just me and my gear, let alone my daughter and i ...
i would suggest a 3 man tent, and a pound or two of weight is neither here now there ... you will lose this off the body on tour anyway ... more important considerations are layout, ease of putting up, waterproof, wind resistance, etc ...
i am thinking of getting one of these, which has a 'garage' for the bike as well ... protects the bike from foul weather, and also away from prying eyes ... it is only 200gms more than my current 2 man tent ...
would your next tent be better classified as a 1 man and 1 woman tent, or a 1 man, 1 woman and 1 spare tent?