I too prefer sleepers with feet so that I don't have to put the kids in socks. The tried-and-true brand for my daughter has always been Carters. But I had trouble finding a summer weight sleepers at Carters, with feet, for my son this year in anything larger than 12 months. A couple weeks ago, I found some nice lighter-weight cotton sleepers at Costco from the brand "Little Me." They have long sleeves (which I also prefer, since my son is not using a blanket yet). The material weight is great for when the air conditioner is on, but a touch too heavy for a really warm, humid night with windows open.
I think "Little Me" is carried at some nicer Dept. stores, but I'm not sure which ones. I was at Costco this weekend and saw that they still had the sleepers. The size runs to 4T.
I didn't put a blanket in my daughters crib until she was about 20 months old. But I'm sure that is MUCH later than most people! My son does not have one yet. Maybe this winter.