Seems like you made up your mind and sorry for late reply.
You made the correct choice
B175 HW would suit your needs perfectly.
In my past boat, during the build I installed an airmar B175HW and a B175L on a Garmin system.
For all you inshore fishing the B175HW will do it all from finding fish and bait, to good bottom readings. Machine was fine for reading down to 600’
The B175L I installed for canyon fishing or if deep water wreck fishing, to help give a better detailed view of water column and cleaner bottom view in the deep water.
If I was canyon fishing or fishing tuna I would split the screen and run both. Great comparison. Even down to 600 the B175HW picked up exactly what the “L” did. Just not at profound marks when deep.
I was told by others running the “M” or medium, that the B175M really does not do a great “inbetween” job compared to the HW and L. So for few more dollars, about $1500 for extra ducer and install,
I went with both. If in your shoes and could only pick 1, I would go 175HW, no doubt.
So for your needs you described, the Airmar B175HW will fit your bill very nicely. Great ducers just don’t paint them and end of year be careful when marina power washes. Lil soap and water and no abrasive cloth, I just used my hand, is all you need to clean at end of season.
If you want more specifics PM me
Good Luck