This seems like a no-brainer to me...

If Zen was your count of choice back in the day, then pick up from where you left off. Zen is a good count and also happens to be the system I use. So stick with Zen and I18 and you're good to go. And even if you aren't playing much, I would still consider purchasing Norm's software, CVCX. It's only like $85. It'll pay for itself and more within one year of only playing 30 hrs or so.