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If money isn't an issue, I would go Wind Crystal + Bone Chip and NPC the Bone Hairpins to NPC. That'll get you to level 4. Then toss a 2nd Bone Chip in the mix and get Bone Arrowheads, that'll get you to 9. What you do with the arrowheads is up to you, you could sell them but they sell really slow on my server, typically 1 a week. Then finally go for your Gelatin, you'll probably get a few breaks here and there, but Bone Chips are very cheap and plentiful on the AH.

Bone Chips all the way!

EDIT: P.S. Fire Crystal + Giant Femur + Distilled Water will give you more bang for your buck. You may want to consider leveling your bonecrafting to 28 if you need gelatin on a regular basis.