If you are already set on the stats you posted, you really only have two viable options. Shield or riding. 5 in iron flesh is a waste. That skill is an all or nothing skill. 5 riding gets you all but the two top horses plus it naturally works with your polearm skill. 5 shield gets you the huscarl, which is apparently the best. I don't use shields so I have no idea.
Shield good: block projectiles, cheap repairs
Shield bad: can't use a melee weapon, lose a throwing slot
Riding good: mow down infantry, complements polearms
Riding bad: expensive, can't use every round, hated(targeted) by all