Moving up limits when money doesn't matter. (NL and Limit)

[Jack Bando]

I mainly play NLHE and usually play at 10NL or 25NL.

But I've been playing some other games on the side (LHE, 7CS, 7CS HL, PLO8, Omaha 8-lowest levels available (Stars)), and wonder what I should use as a measurement of when to move up.

Having enough buyins/BB's for the next level is already done due to NLHE.

So what's a good way to decide that you should go to the next level? ($ earned, buyins/bb's won,BB/100,BB/hour, hours played with a profit, etc...)

Thanks