Reading this: BCT15 - The RadioReference Wiki
seems to indicate that the BCT15 has text tags, and text tags are good! That was one reason I sold my BCT8. I have never had a 15, but I know it has a lot more memory and other features than you have now.
The question I would ask is do you need digital capability yet? Check the Database for your area in Houston. Current local digital includes the P25 system, highway patrol, and federal. Also note that in a few years the P25 trunked system may begin TDMA P25 Phase 2 (not monitorable on today’s radios).
My advice is to upgrade if you can and I know you will enjoy the dynamic memory structure of recent Uniden models. And, if you particularly like the BCT15, please have a look at the new BCT15XT and compare the features and price of both:
Uniden Bearcat BCT15X Police Scanner Radio
Good luck and happy scanning!