If you are wanting to just listen to public safety and city services and utilities, the scanner doesn’t need any upgrades. If you venture into businesses, schools and such, DMR and NXDN are going to be the ones you need. Zero reasons to purchase ProVoice since San Antonio turned off their old system, and Bell County has presumably mostly switched over to P25.
As rattler has already mentioned, you do not need any of the upgrades to monitor public safety agencies (law enforcement, fire, & EMS) in your county. Also as noted, don't waste your time or money on ProVoice. San Antonio & Bexar County have already dropped that system. While there is another ProVoice system in the Corpus Christi area, only a handful of the talkgroups are ProVoice. And, as has already occurred in the San Antonio area, the ProVoice system is being replaced by a P25 Phase II system, which the SDS100 can monitor without any upgrades,
There's a handful of DMR trunked systems in Travis County, most of which are businesses. One school district (Lago Vista), is using a DMR system for their buses. There's probably other users of DMR that are not listed in the database at this time, but they're almost certainly, businesses.
Eventually, railroads are slated to move t using NXDN, but that is probably several years away.
You can use this website, Digital Frequency Search, to see who is licensed to use DMR & NXDN. However, that does not show who is actually using one of those formats, only that they are licensed to do so. You can add the DMR and/or NXDN upgrades at a future date, if you find a company or agency of interest has started to use one of those two formats.