If you definitely want A sail at that size, and to win under IRC, then I cannot think of anything that would be a better bet than the J97. Although it is worth noting that in the UK a few J97s are starting to go to S-sails for round the cans.
If you're not wedded to A-sail then there are several options in the thread above that will either
a: be better on the ww/lw track. (eg JPK1010)
b: have better interior for family cruising. (eg Elan 333)