I wouldn't suggest you start grinding 25nl just yet. I came off beating 10nl for 25kish hands for 4ptbb/100 and took shows at 25nl with $510 BR and just busted down quickly. Tried against at $580 and the same thing happened. I then just continued to grind 10nl till $750 then moved up.

I'm pretty sure those two shots set me up to become a BR nit for the rest of my poker career. It just feels so much better moving up knowing you have buyins you can afford to lose before dropping down.

I agree with spoon in saying you need to make sure you are a winning cash game player at 10nl before you jump up to 25nl with a very vulnerable roll. So put in some 10nl hands and see if you winrate dictates you move up or not.