If you're into fishing, certainly the sounder. If not, unless you have a specific need for it, it's of little use IMHO. If you'll be doing lots of cruising and exploring, it may be of some use. However, in our area, you're more likely to go from 30' to a 1' rock! In which case the sounder is again, of little use. I want the sounder, as one of the important uses of my boat in the future will be coaching my wife's disabled sailing team. Knowing water depths across the racecourse will be useful strategic information.
I would seriously reconsider a fixed mount VHF. I frequently carry a handheld, but in my history I have:
1. Dropped it overboard
2. Run down the battery many times
3. Broken the antenna, rendering it useless
4. Left it behind many times
In my entire lifetime of boating I have never experienced any failure of a fixed mount VHF. Not to say you can't have an electrical problem which would cause a problem, but it's never happened to me. And you can't forget to bring it with you or recharge it. Again, just my opinion & experience...