The extra legroom in the exit row seats is negligible on the A320, compared to the non-exit rows up to row 13 (which have extra legroom compared to rows 14 and beyond).

My advice would be to go for A and C in the first row, but keep a keen eye out on curtain shifts, particularly up to T-24. If you're less adventurous, my favourite seats for a couple after the converted pair are any EF seats up to row 13.