I had a 30/12 build with medium body armor (sarranid mail shirt), which gave me about the mobility of a plated 15 agi guy i would guess.
I could take tons of arrows and blows, was mobile enough to avoid a lot of hits as well. considering my pole inf playstyle, I would use 30/12 if you have a longer weapon, and 27/15 if you like closer fights.
the HP on both are far enough for any of your purposes