Was bored so i did some AP vs AD laning math
(2400g)
effective stats. 60mr / 45ms / 20% ten / 20 AD / 110 HP / (at level 1)
effective value. 1,080 / 540 / -----------------/ 700 / 293.33 /
2,613.33
(2300g)
effective stats. 45ar / 35ap / 45ms / 15Mpen / (full stacks)
effective value. 900 / 761.25 / 540 / --------------/
** 2201.25**
(2800g)
effective stats. 45ar / 60ap / 15Mpen / (full stacks)
effective value. 900 / 1,305/ --------------/
2,205
... calculation sources

20% tenacity and 15Mpen values are considered equal
due to equal costs of
&
luckly both are difficult to quantify
...
I did the math, feel free to express opinions below.
Obviously this doesn't consider all the ways you could spend ~2500g
proud...