You would do really well with the Antelope. I used one for years as my only bag, plenty of winter use in Michigan's UP. I can and do shift the down before going to bed if temps are too warm. IMO, it's about the closest to perfection in a bag you'll find. Since you'll have a summer/3-season bag, I'd go for the Antelope over the Versalite--the Antelope has a full 6 ounces more down, which in reality will create much more than the 5 degree temperature differential they report between the two bags.