I guess it's a matter of preferences. To me, a quilt is not a quilt unless it is "scrappy". I never buy coordinated sets of anything, it's too matchy-matchy for my taste in quilts.
I'm working with a reduced fabric budget, too, so I'm on the lookout for sales. If I don't particularly like a print, but the color fits in with the values I'm looking for, I'll still use it, because I mostly use strips that are 2 inches or less. I save the really ugly prints for the smallest pieces!