Here my suggestion:
ARI:
ring of protection +1 (2000 gp)
longsword +1 (2315 gp)
chain shirt +2 (4250 gp)
potion of CLW x2 (100 gp)
potion of ex. retreat (50 gp)
Gold: 1329 gp
Total Value: (10 044 gp)
JANGO:
masterwork light crossbow (335 gp)
wand of magic missile x25 charges (1875 gp)
potion of CLW x2 (100 gp)
potion of disguise self (50 gp)
potion of endure elements (50 gp)
Gold: 4319gp
Total Value: (6729 gp)
KHALIA:
masterwork light crossbow (335 gp)
crossbow bolts +1 flaming x30 (5010 gp)
wand of CLW x25 charges (375 gp)
potion of CLW x2 (100 gp)
potion of mage armor (50 gp)
bag of holding (2500 gp)
Gold: 1674gp
Total Value: (10044 gp)
SKARGHASH:
amulet of natural armor +1 (2000 gp)
masterwork shortsword (310 gp)
masterwork light crossbow (335 gp)
potion of CLW x2 (100 gp)
potion of jump (50 gp)
Gold: 3935gp
Total Value: (6730 gp)
All Gold come from:
Found gold: 6000 gp
Sold items: (For 5257 gp)
The bracers of armor +2 (4000 gp)
masterwork heavy mace (312 gp)
masterwork armblade shortsword (310 gp)
chainmail +1 (1300 gp)
javelin +1 x2 (4602 gp)
Anyone can buy back any item sold at half there price, as it is the value in gold that come back to the group. That mean that if Ari want to keep a javelin, he would have to spend 1150.5gp, the aount of gold it has brought to the group. Same thing, if I judge Jango want to keep the bracer of armor, I would buy it for 2000gp.
That make teh share roughly the 30/30/20/20 proportion, but it is also been split so everyone have some good spending money and have the titems that fit more there character.
Ari finish with the ring because of his marvelous touch AC, as the ring will help him on that side, Skrag keeping the amulet.