opinions on mortgage providers

We are looking to move our mortgage and I was wondering if people could offer their opinions as to the wiseness of such a move. I am specifically considering ACC or NIB. I am interested both from the stability of the banks in the current climate as well as the day to day ease of dealing with them.
many thanks

what difference does it make to you if your mortgage provider is stable or not? you owe them money, not the other way around.

1. If I move my mortgage, I don't want the trouble of having to move again or deal with a bank going bust
2. I intend to look for more money for an extension in the near future. Due to the issues with my current provider, I have no intention of going to them with such a request and so would like to move to a new provider who would be likely to give me more money.

AIB would be the most stable in my view. they have the largest cash deposits