I have two builds I like for a level 30 cavalry build (assuming you plan on retiring as soon as you hit 31). In both instances I basically split WPF between 1h and polearms. It's a nice hybrid build (can still play as infantry) and gives me more than enough WPF to be competitive with swing speeds. I honestly don't notice a huge difference between 70 WPF and 120 (there is a difference, but having 50 or 70 WPF is still not THAT much slower than 120). WPF makes a difference, but it's something like 10% faster at 100 WPF than at 1, so not the end of the world.
This 18/18 build should have 6 power strike, and 3 athletics (instead of 5 ps, and 4 athletics)
15/18 is my preferred build (and what I currently use):
I figure the extra Power Strike and 3 strenght with my 1h broad battle axe gives me about 5-6 extra damage versus really light armor, but I kill really light armored people very easily with 5 power strike anyways. 3 extra strength and 1 more power strike only give me 1-3 damage more versus heavily armored people, so not a huge difference (having the 6 athletics and 6 shield is really nice).