Here's what I got, but it's not meant to replace magic weapons, just provide a greater variety in mundane items, at a lower price than magical items. I haven't yet decided what the Craft DCs would be for better-than-masterwork items. I also haven't gotten anything done yet for superior/grand masterwork shields.
Superior Masterwork Weapon: Replaces masterwork, full cost must be paid whether or not item would already have been considered masterwork, grants +1 attack and damage, bonuses do not stack with enhancements, nonproficiency penalties with it are reduced by 1, hardness is 115% of normal rounded up, hit points are 115% of normal rounded up, magical enhancements cost 5% less all around.
Grand Masterwork Weapon: Replaces masterwork and superior masterwork, full cost must be paid whether or not item would already have been considered masterwork or superior masterwork, grants +2 attack and damage, bonuses do not stack with enhancements, nonproficiency penalties with it are reduced by 2, hardness is 130% of normal rounded up, hit points are 130% of normal rounded up, weight is 85% of normal rounded down to nearest 1/2 pound, magical enhancements cost 10% less all around.
Superior Masterwork Armor: Replaces masterwork, full cost must be paid whether or not item would already have been considered masterwork, reduces armor check penalty by 2 but not below 0, grants +1 to max dex bonus, hardness is 115% of normal rounded up, hit points are 115% of normal rounded up.
Grand Masterwork Armor: Replaces masterwork and superior masterwork, full cost must be paid whether or not item would already have been considered masterwork or superior masterwork, reduces armor check penalty by 2 but not below 0, grants +1 to max dex bonus and +1 better AC, hardness is 130% of normal rounded up, hit points are 130% of normal rounded up, weight is 85% of normal rounded down to nearest 1/2 pound, arcane spell failure from the armor is reduced by 10%.
Masterwork Tool: Grants +2 on checks made with the tool, holds 15% more weight, has 15% larger space.
Superior Masterwork Tool: Replaces masterwork, full cost must be paid whether or not item would already have been considered masterwork, grants +4 on checks made with the tool, hardness is 115% of normal rounded up, hit points are 115% of normal rounded up, holds 30% more weight, has 30% larger space.
Grand Masterwork Tool: Replaces masterwork and superior masterwork, full cost must be paid whether or not item would already have been considered masterwork or superior masterwork, grants +6 on checks made with the tool, hardness is 130% of normal rounded up, hit points are 130% of normal rounded up, holds 50% more weight, has 50% larger space, weight is 85% of normal rounded down to nearest 1/2 pound.
Code:
Name Price Weight/Space/Holds
Masterwork Weapon +300 gp ----------/----------/----------
Superior Masterwork Weapon +700 gp ----------/----------/----------
Grand Masterwork Weapon +1,400 gp 15% less/----------/----------
Masterwork Ammunition (1 Piece) +6 gp ----------/----------/----------
Superior Masterwork Ammunition (1 Piece) +10 gp ----------/----------/----------
Grand Masterwork Ammunition (1 Piece) +17 gp 15% less/----------/----------
Masterwork Shield +200 gp ----------/----------/----------
Superior Masterwork Shield +450 gp ----------/----------/----------
Grand Masterwork Shield +800 gp 15% less/----------/----------
Masterwork Armor +150 gp ----------/----------/----------
Superior Masterwork Armor +350 gp ----------/----------/----------
Grand Masterwork Armor +700 gp 15% less/----------/----------
Masterwork Accessory +200 gp ----------/----------/----------
Superior Masterwork Accessory +350 gp ----------/----------/----------
Grand Masterwork Accessory +700 gp 15% less/----------/----------
Masterwork Tool +50 gp ----------/15% more/15% more
Superior Masterwork Tool +150 gp ----------/30% more/30% more
Grand Masterwork Tool +300 gp 15% less/50% more/50% more