I'm curious about the 1680 and it's crystal. Is it really worth spending $150+ on a GEN crystal when there are replacement T-127 crystals all over the web for $25 or less? I've read some info about a "Black Hole" and witnessed it with a 1680 that I had briefly last year. As I begin this new build, just thought I would solicit some info from all of you experts that know way more than me.