feat advice for melee focussed battle*cough*cleric please?

[jonqrandom]

asking here 'cos this has roughly nada to do with healing or casting:

i have five feats left to take during my last 6 fighter levels of this build (12c/8f)
i currently have; toughness, THF, power attack, cleave, great cleave, imp. crit. slash (also emp. heal and maxi).

these are the feats i'm wondering about, but feel free to suggest others;
quicken (so my bursts, heals and divine punishments don't slow down my melee so much), ITHF, GTHF, stunning blow (but ideally then i'd like quick draw so i'm not 2 seconds down switching to a stunning maul or greatclub and then back to a dps weapon), sap, imp. sunder and b-sword or d-axe (the proficiency feats are pretty much outliers, it could be nice to be able to turtle up and still THF but i'm not sure it's worth a feat).

currently running at 32 str with +2 tome, +5 gloves & +2 ship buff at level 12 - already have human str and fighter str 1, so at 20 would be 36 with just a +6 item, i should be able to get into the low 40s sustainably without a problem. i'm just saying all this so you'll know whether my stuns will have sufficient DCs to be useful, i'm aware that's not an impressive str score obviously, i don't want to waste a feat (or two) on something that'll hardly ever proc.

anyway, thanks for taking the time to read this, and thanks doubly if you'd care to advise me