In order to reduce how much optimization matters (...)
What an unusual requirement.
Well, I want to rank the classes themselves not how much you can optimize them, and most classes are going to need feats and equipment to win encounters so them using as little as possible seems ideal for this. Technically they should still be optimzed just to the point system as opposed to raw numbers.
Here is 2 i did so far
http://www.myth-weavers.com/sheet.html#id=962732barb hp 78 ac 22, 20 on charge +12/7 2d6+7/10 5 rnds of frenzy
Ac
Barbarian lv 7 wealth hp 78 AC 23 2 19 on charge +2d6+10 12/7
rop +1 amulet of nat armor +1 weapon +1 armor +2
strength and constitution +2
Round 1 Barbarian frenzies, and charges 14/9 37.4 damage to giant on charge Giant does 28.98 to barb.
Round 2 B deals 31.79 G deals 24.25
Round 3 B Deals 31.79 G Deals another 24.25 B 1.52 G 1.02
R 4 Barbarian kills giant usually.
Hide
Warrior 77 hp ac23 16/11 2d6+12
giant hp 102 ac 20 16/11 2d8+10 19 15
25.35 vs 22 30.18 vs 20 17.06 if goes first
R 1 Warrior charges giant deals 22.33 Giant attacks back for 27.77
R 2 W FA for 31.62 G Does another 23.15
R3 W 31.62 G 23.15 Warrior at 2.93
R4 W 31.62 G 23.15 Giant should be at -1.5 warrior will be at -26.08 if the giant lives