Hi Mike,
congrats on your new purchase!
BTW, you know, handy men are top ranked by the opposite sex, specially after getting married, so you're in the right way though...
Regarding to the outboard amp., my first option was also the A500. I had a credit at Sam Ash, but they don't carry this specific model, so I ended up grabbing the Samson Servo 300, which is also owesome!
The only (-) I saw, when compared to the A500, is the lack of XLR ports (which in fact I'll never use anyway...).
No humming, buzzing, just plain and good sound all the way thru the L/R mains now, with much more dynamics then before. No regrets at all!
As a side note, why don't you start producing/selling racks to the AV community? You could become a rich man pretty soon!
Cheers.