I love my old Northface 'Bullfrog', which was billed as a 3 season 2 man tent (or roomy one man tent, as I am 6'3".) It has since been replaced in the North Face line by such tents as
The Talus 23. The nice thing is you can pitch just the rainfly in really warm conditions, or just the tent (which is really well ventilated) in warm but buggy conditions.