I have had shared hosting accounts where I used Ensim.... I think Infopop uses it. I think it works well - but it's not my favorite.
I've used CPanel and that's the one I was leaning towards - just like you said - it seemed easy and offered a TON of features. Sort of value added.
I've never used Plesk.
I guess I might lean towards CPanel because I seem to like it best and won't have much of a learning curve myself.
It's good to know you like it and are happy with it.
Thanks.