I second that...the ribbon mics in the IR's are my go-to IR's. The 121 & 160 work great in tandem. I almost always run two cabs, one using a 121 (Royer ribbon mic), and the other using a 160 (Beyer ribbon mic). The two blend very well.
I live in Austin, and SXSW is always a fun way to spend three days, wandering downtown, listening to all kinds of music.
If any Helix users are playing SXSW this year, I'd like to come to your gig and hear how you're using the Helix.
Rock on,
Scott.