What exactly are wanting: a grill, a smoker, a combo grill and smoker?
The UDS is a great smoker so I'm curious what you didn't like about yours that you want improved? If you don't like a UDS, I can't see how you will like a WSM. If you want to grill/smoke on a budget, get a Weber Kettle. If you want to grill/smoke/sear(700F+) on a budget, get the Acorn. You can step up in quality, size, and/or features if you have a bigger budget to work with by going with a ceramic komado.......but I'm unsure you gain functionality.
So what and how are you wanting to cook?