HDX Interface suggestions/comparisons

[real_eyes]

Just fell into a DUC black hole while looking for some info so 2 hours later, I'll just ask..... (I think I just suck at the search option)
Have a client building a new studio, strictly music tracking/mixing. (Lots of tracking). Fresh new, fully loaded Macs, at least 32 channel I/O, some sort of mid level console and I've got them most likely in for an HDX system. They were on HD/N with a Lynx Aurora previously (2011) and had hell of a time with monitor latency so looking to avoid it. These guys aren't the most technical so they don't want to waste time playing with buffer settings and all that fun stuff. Been there, done that...
Anywho, looking for suggestions on interfaces... HD IO, Symphony IO, Aurora...etc. What are people finding the best sounding and plays the nicest with HDX these days? Rednet sounds like a great option, but again, probably more complicated than these guys need for a 1 room setup, even if it's just for converters and I don't know enough about tracking through them to push it. I was leaning towards a Symphony, but not sure the +/- compared to comfort of an Avid card talking to an Avid box.

Not that money is no object, but money is not MUCH of an object for this case. Must be nice eh...

Thanks in advance for any suggestions.