Right now my UA-5 is just a digi-mod (done by Oade). Hopefully in the future, I will get one of the mods done.
I run CM300>Nak MX-100>UA-5>JB3 and I'm very happy w/ the results. Would a P, T or W mod help, no doubt, but since I'm on a budget, I'm happy until I save up the money for a mod.
I have heard a lot of Mark's, from this boards, shows that are CM300>w-mod UA-5>D7, and I think the w-mod sounds really nice.
I wish I've heard more shows w/ the P and T-mods.
Maybe doing a search on archive.org is in order to listen to some different sources.
Hope this is helpful,
Jim