ok you asked if a j 30 is the right boat for you ...
I bought mine beginning of the year and I love her.... We stay every weekend friday til Sunday on the boat. She is great for extended daysailing and I would go as far as to say short cruising. A little too small for full time cruising for my taste. but I wouldnt mind spending more time as I do right now.
In the meantime we smoked the competition in our Club Beercan Regatta Championship with 4 bullets 3 seconds ... lol
We sail and race the boat as a couple, when the wind pipes up we occasional have a 3rd person on board ( we race non spinaker class) You can call that undersized crew for sure.... Put a roller furler and self tailers on it and she can be sailed singlehanded pretty easy
Thorsten