HTC Titan (TNZ) Best &/OR Simplest upgrade

[messor]

So, I have an old HTC Titan with WM5 lying around and saw these forums, wondered if it was worth trying. I have done a few modifications before, however i am slightly embarrassed to admit i'm a little confused here. Could someone please explain to me:
1. What is the simplest (or stablest if needed) ROM to install, full featured etc.
2. As the phone is basically retired I probably won't reconnect it to TNZ, do I still need the radio rom and to retrieve those settings? (I only want it for WiFi and apps really)