You'd need about 28 AC for it to be effective 50% of the time, so...
14 Dex (base): free; +2 AC
gloves of dexterity +2: 4,000 gp; +1 AC
+2 mithral full plate: 14,500 gp; +10 AC
dusty rose prism ioun stone: 5,000 gp; +1 AC
ring of protection +1: 2,000 gp; +1 AC
amulet of natural armor +1: 2,000 gp; +1 AC
+1 animated heavy steel shield: 9,170 gp; +3 AC
That's 29 AC for a cost of 36,670 gp. This would leave you with a mere 12,330 gp to spend on your weapon and other goodies. Winged boots or a belt of giant's strength would be outside your price range, but you could get a +1 shock weapon for a little more than 8,300 gp.
Now, if A&EG is a valid resource, you can have a bit more fun.
14 Dex (base): free; +2 AC
gloves of dexterity +2: 4,000 gp; +2 AC
masterwork dastana: 175 gp; +1 AC
+3 chain shirt: 9,250 gp; +7 AC
dusty rose prism ioun stone: 5,000 gp; +1 AC
ring of protection +2: 8,000 gp; +1 AC
amulet of natural armor +1: 2,000 gp; +1 AC
+1 animated heavy steel shield: 9,170 gp; +3 AC
That's 28 AC at a cost of 37,595 gp... but it gives you full move speed and lets you pick up another +1 AC from Dex later on down the line. If your DM rules that you can enhance dastana and that their enhancement bonus stacks with that of a chain shirt, it would be considerably cheaper to go dastana + chain shirt than it would be to go for any heavier armor.
14 Dex (base): free; +2 AC
gloves of dexterity +2: 4,000 gp; +1 AC
+2 mithral full plate: 14,500 gp; +10 AC
dusty rose prism ioun stone: 5,000 gp; +1 AC
ring of protection +1: 2,000 gp; +1 AC
amulet of natural armor +1: 2,000 gp; +1 AC
+1 animated heavy steel shield: 9,170 gp; +3 AC
That's 29 AC for a cost of 36,670 gp. This would leave you with a mere 12,330 gp to spend on your weapon and other goodies. Winged boots or a belt of giant's strength would be outside your price range, but you could get a +1 shock weapon for a little more than 8,300 gp.
Now, if A&EG is a valid resource, you can have a bit more fun.
14 Dex (base): free; +2 AC
gloves of dexterity +2: 4,000 gp; +2 AC
masterwork dastana: 175 gp; +1 AC
+3 chain shirt: 9,250 gp; +7 AC
dusty rose prism ioun stone: 5,000 gp; +1 AC
ring of protection +2: 8,000 gp; +1 AC
amulet of natural armor +1: 2,000 gp; +1 AC
+1 animated heavy steel shield: 9,170 gp; +3 AC
That's 28 AC at a cost of 37,595 gp... but it gives you full move speed and lets you pick up another +1 AC from Dex later on down the line. If your DM rules that you can enhance dastana and that their enhancement bonus stacks with that of a chain shirt, it would be considerably cheaper to go dastana + chain shirt than it would be to go for any heavier armor.