Thanks Vince & Godfrey.
I'm thinking I'd like a 30-45-65 set, but whatever I end up with will take a while to build out at the prices these lenses are going for. That's ok, it makes me think about what I really "need" before purchasing.
The 21 is intriguing, but I fear it is more of a "special effect" type lens for how I usually shoot. 30 would probably be plenty wide.
And the 80 is certainly desirable, much like a Noctilux would be...but again, I'm not sure I "need" it.
The 90 seems great, too, but I have never been a fan of that FF-equivalent ~75mm focal length. Maybe the 4:3 ratio would change the way I see that length; it certainly has with regard to the 45.
The nice thing is, the 45 is so nice to shoot with, that I don't see any other lens as pressing right now.