Arny, excellent stuff and I was hoping you would reply!

I'll take another look at the plugins, but since this is to be a pair that
three people share from time to time, I know they won't want to share
plugins. I haven't had a chance to go out and try these, I hope to this
weekend, but compared to the Sennheiser 580s, how do these stack up:

+ Sennheiser PXC250 (noise canceling)
+ Sony MDR-V150
+ Sony MDR-V250V
+ Sony MDR-V300
+ Sony MDR-V600

Thanks!