Replacement sails - Hood''''s Vektran
You do need to clarify the condition of the main first. If you''re not comfortable eye-balling it yourself (the shape when flying in different conditions tells you what you need to know) have a sailmaker do so, and then accept his advice with a grain of salt. If your main is judged as blown out, given your interests above, I would go with an all Dacron main and put your money into a performance jib.
The jib provides most of your drive, so should be the better sail if forced to chose.
You haven''t said the winds experienced in you area. The 110% is too small for light to moderate winds. If you don''t sail in a extemely light or heavy air region, go with a 135% as your primary jib. Again talk with a region sailmaker about these considerations. A 150% is too big for a family to trim or haul around.
You can leave a 135% up most of the time as you can reef it to 110% when daysailing in a breeze. Keep the 112% on for the winter. Also use it when racing in a breeze as it will point better than a reefed jib.
Good luck (I''m a big fan of UK tape drive sails - check then out).