How often should I be buying new gear?

[Verore]

Got upgraded into Heavy Skirm and everything is so expensive. All I bought was a poleaxe from the auction house because it was kinda cheap and don't really have enough money for the other new armor + throwing weps that just unlocked. So right now I have craftable javelins, a poleaxe, khergit war helm, lammellar over mail, mail gauntlets and khergit boots. I figured I'll just keep the rest of my gear til I upgrade again and buy those gear.