9x MR per level blues
9x armor per level yellows
9x armor reds
3x Spellvamp quints
1 point to make exhaust stronger
1 in the summoner spell slot and 4 in the hp mastery
3 points in armor
get the spellvamp and cooldown reduction for summoner spells.
Get all the bonus MS you can
Ignore CDR go for the hp regen.
bot lane support tank
Stay in lane forever after the first trip back. Use hp regen and excessive defense to stay alive, build no power whatsoever unless it gives more spellvamp.
later on you act as an hp drain tank and make bypassing the front lines difficult or initiate by dropping a lantern and approaching the only fashioned way
ninja tabi or merc treads (in that order)
items you want later
banner of command
and maybe morellonomicon.. he'll have armor and MR...