As for monitoring.. yes, I'm glad you mentioned the Yamaha DXR10. I was actually thinking of the cheaper DBR10 for this application, but maybe there's a reason to use the DXR10? Oh, I just checked out the L2t...wow, that thing is nice but quite expensive--might have to think about that one. I've also got a Schertler Jam150 acoustic amp that I could, I think, use for monitoring. For playing "out", I mean small pubs and coffee houses...that sort of thing. She's primarily an acoustic guitar player and what I'd term a "pro" singer in the sense she's produced a CD or two and has done some proper televised stage performances. She doesn't make a living at it per se. I've been looking at mixers as well lately and some people have recommended the Allen & Heath ZED10FX. Again though, I don't even have any experience with any of these things so I'm doing all I can do get educated. This is one big learning curve for me, but I'm getting there. I've made friends recently with a guy who runs a studio, produces, etc.. and he's been helpful in the short discussions we've had on this topic, but nothing in depth so far.
I'm kind of curious as well, after having read a number of the threads on this forum, how everyone here is so knowledgeable.. I mean, the technical expertise seems off the charts. Are a lot of members here engineers? Just saying.
Right now, based on this thread so far, I'm leaning towards the full Helix model.
Geo