Lennox G61V Gas Furnace with a Lennox AC unit. What should I expect to pay installed by a very good company?

I'm in the Northern Midwest so long winter 6 months and mild to very hot summers. The Furnnace is 95% efficient and combined with the AC unit I'm told I should get 15 seer rating. My quote is pretty High (for me not knowing comparisons anyway) so far for this combo and I was wondering what others have paid for a simular system from a good company as I realize the installer is very important. 10 year parts and labor with all the nice satisfaction gaurantees are included. Thanks.