Definitely interested in the silver litz, so will have a think about that early in the new year - like you say, no harm in demo-ing
I'm also interested in the Sensaphonic sleeves you've mentioned, although - being in the UK, my nearest place for impressions is Ireland - that could be a little complicated! (will look into it, as I'm hoping that I could get impressions done anywhere, and just sent to them!)
...Also, I'll check out re the black filters, like you say, the odds of me using them are far less than what me using the white filters would be, so - if I could jury rig the blacks into something more useful, more power to me...
Thanks - looking forward to squeezing even more out of these