I can only see benefits to the OP (and many others) in talking about consoles in this thread, as that'll possibly give him (his mate) ideas and maybe open their thinking to some other avenues they might not have considered. I know I loved every post about different options when I was looking for a desk a while back.
I can't compare the X-desk/panda to the Auditronics, as I've never worked on an Auditronics console itself, but I do have here a pair of modules from the same guy you bought your frame from, racked up by Rob that I haven't really used, but only tried out briefly.
They have the output cards as well, and I think they sound pretty good. I probably wouldn't be able to get my money back that they owe me, but I'm pretty sure they'll come in handy most of the time.
I was wanting a bigger desk at the start of my search as well, (around 10k budget) but quickly realized that nothing special could be had for that sort of money, so I settled for a S'craft Sapphyre. It was a very good sounding desk and very flexible, with a full p/bay etc, but after I realized I wasn't going to get an adequate space any time soon, I had to move it. I did a few mixes on it (it took some time to fix it up first) and it sounded very good...well sounded great for the money.
Then an X-panda showed up on ebay very cheap and I grabbed it. I knew I could use it on its own in the meantime, (with a separate little mixer that had a few stereo inputs and a master section), until I get the x-desk, which i did soon after. Well, this mixdown setup sounds fantastic. I always had an impression that SSL sound was of a clean and thinner variety..well this is kind of clean, but not thin for sure..It sounds full, balanced, punchy, defined and pretty bloody WIDE. Also, the headroom is plentiful

. OK, I must admit my mic locker and preamp selection has grown somewhat lately, and this contributes to the improvement in quality, but the SSL sure sounds much better than the ITB summing.
So to answer your question: I can't see how you can beat this sort of a setup for sound, flexibility AND reliability for around $4-4.5K.
Fair enough if you need a desk that'll pull in outside engineers, labels etc.. (which i was after, before I realized the new place isn't happening) then something like this wouldn't work, but if it's mainly going to be you working in there in a home/project type arrangement + with limited space, this thing is it IMO.
Another thing is: no matter what console you get, unless it's full of 10 or 80 series neve modules, you will want additional outboard, won't you? We all do LOL. That is another reason this mix set-up is really good.
There's nothing on this desk (X-desk+x-panda) that is an extra that I won't use, and that's what I love about it. Everything is used!! I'd love to have an extra couple of aux sends, but I can live without them.
I think I've found the right setup for some time to come**
Hope this helps you Evan, and also the OP in their decision making process.
** I've just spent about 45 minutes looking at used consoles on US brokers' sites LOL!