If you are a key person tied to the success of the business, it’s common to negotiate things like stay-put incentives and payouts tied to company performance.

The reason for the acquisition also will be a big factor. If they have any intention to continue to grow your company you probably have some decent leverage. I’d seek to meet with them and be prepared to demonstrate the value you bring. It might be good to have an idea of what you’d want to be happy, but I’d be inclined to see what they offer first and negotiate from there. No telling what they might offer you and you wouldn’t want to short change yourself if they would offer you more than what you would ask for.

I’d be more concerned about a non-compete than an NDA. NDAs are pretty standard. I would still recommend having a lawyer review anything.