Blackburn Local Basket
This one looks interesting to me. I don't have the basket model but do have 2 of the local deluxe racks. All have versatile mounting options and height adjustable. Can be mounted on front or rear.
Also, you can use a Wald basket attached to any rear rack as lots of folks do. A milk crate mounted on the rack works as well and is cheapest option.
I like the permanent nature of the Blackburn basket, its adjustability, and ulock holder, myself.