I had great results with matched packs from Pro-Match Racing
and they have served me VERY well (I am not supported by them).
I have 3 3600 IB packs that I have been running for 1 1/2 years (very often) and they still have lots of punch. My Novak Smart Tray II tells me that the cells are still closely matched.
P.S. Once you have used matched packs you will NEVER go back to using stick packs that are not matched!