Best Billing Application for Nortel CS60

I have a digital Nortel CS60 switch.  I have been using TM3 (CS1000) for billing purposes.  Does anyone have any opinions as to what would be the best replacement for this dated software?  Would a current version simply be the best move, or is there something else out there that is better?  My TM3 build is going to need a reinstall anyway, so now would be a good time for me to change.
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It depends a bit on your long-term plans - will you be replacing the Nortel anytime soon?  Will you upgrade to Avaya Aura when you do or go to the open marketplace?
If you want a platform that works with both Avaya "blue" and "red", we have two clients using the Resource Software International (RSI) package.  A bit costly but very good and they work with both platforms very well.
Your other option is to pick a product that performs call accounting on a wide variety of platforms, such as Calltrack or Calero (was Veramark).

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