I also owned a HydraSports 212 WA. Mine was a 2000 with a Johnson 150 on it. Had it 9 years and really liked the boat. I agree with FNG that the 150 felt a bit underpowered at times, but I was never looking for top end speed, so it wasn't a big problem for me. That being said I think a 175 would be perfect for this boat.
I've taken it out to Stellwagen Bank (about a 20 mile run) quite a few times and never felt concerned, although these trips were always based on the weather forecast being good. Great inshore boat, the cuddy is big enough to store plenty of stuff in (although overnighting would be tight). I did not have tabs on mine, and imagine they would have smoothed the ride out a bit in a tight chop, although I got by fine without them. All in all I don't have a lot of complaints...good solid boat. Things held up well the entire time I had it.
Hope this helps. PM me if you have any specific questions.