sometimes it is lovely to just go to the pile, pull out a pack, and make it, without having to think, decide, mull over, and go and get some of whatever. i don't "do" only kits--but what a handy thing to go to when you need to!
i go to "fabric cafe" often (they have nice sales), and buy their 3 or 5 yard kits--the fabric is not too expensive, and i've built a remarkable stash of single yard cuts by doing that. they sell by the yard, as well--but this way i know i'll get three coordinating fabrics, and can make a lap quilt, kid sized quilt, or more/bigger if i want to. it's not cast in stone--they send a free pattern with each, and i can make that one or not. win/win!