I am also 34 and have much the same plan as you, just I had to revise the figures a few times as I had kids :) The increase in required house size + university

I am also 34 and have much the same plan as you, just I had to revise the figures a few times as I had kids :) The increase in required house size + university = loads more cash required to be financially independent. If you know for sure those things won't happen then maybe you can go for 100K. Still, old age could become expensive, we won't be young and healthy forever. You basically need more than 100K so that you have an upward trend continuously to old age. You can't just cover your costs on the interest (and 6% is dangerously optimistic). Good luck to you though.