If you locate the AVR in a cab make sure you have enough ventilation to keep it happy. You don't won't to get a space that is exact fix as there won't be enough space for it to cool properly. Just keep that in mind.
If you're looking for some other recommendations I would look at these...
I have not heard all these so I can't give a personal recommendation. I just picked some smaller 5.1 for you to check out. These sets are priced above where I usually play but I figured it would give you something to look at and run by the wife. I'm assuming that if she doesn't like the look...
I would look at the following
AVR - Pick one...I went with the slimline models for the increased WAF factor
Marantz 1403 slimline $400 basic 5.1
Marantz 1504 slimline refurb $400 better AVR with network included for the same money if you're open to refurbs
Same as above just new $500...