The city of Buda has created a MUD district which includes several neighborhoods. I'd recommend that when you locate a property that you're interested in, do the research to see how much their total tax is. Not many homes are in the actual city limits of Buda. Some neighborhoods will show up in your search as Buda but actually do not pay city taxes and are not in a MUD.
Buda is a great place to live, I'm sure you'll love it here.

First find the value of the property and the taxing entities at http://www.hayscad.com/Appraisal/PublicAccess/default.aspx
Then you can find the tax rate for each entity at:
http://www.hayscad.com/PA/haysweb/taxrates.htm
Your realtor should also be able to give you an idea. If you don't have a realtor yet, let me know and we can put you in touch with one of the best.