Of course, you are right Arjan, I should have said that Reaper itself does not have a track limit.
And you are also right Ernie, however, I don't use any plugins and have the CPU set for maximum program core usage (and have tried all variations in the fruitless chase for stability and performance).
Fortunately, I've been using Reaper in parallel with PT for some years, so am moderately familiar with it and have got the interface looking pretty - will post some pics later.
I'm really not interested in learning another DAW s/w - I've also just dumped Wavelab as I can do everything I need with my DM + DVR1000HD + outboard + Reaper.
I'm pretty happy to be downsizing and streamlining my setup atm - the DM remains the centrepiece of my setup - fwiw if I did go to a different DAW it would be Samplitude.