Bi-amp through receiver vs pre out to 2 channel for fronts

congrats.  What did you get to audition?  I bet you had a good time and probably realized how some gear just didn't do it for you, while these pieces did.  Always fun to hear stories from new folks and their surprise when they hear gear and don't just read about it.  :)

Enjoy your two systems! Please post your thoughts on how they sound to you.

Are you getting the Atoll integrated or just a preamp?  I'm not sure why you're so high on biamping.  I think you're better off getting fewer but better amplifier channels for the same money and forgo biamping. 

Preamp so I can use my sub for bass management and attach the amp to the subwoofer. Otherwise I would have the full signal going to bookshelves which I do t want. 

The monitor audio manual must recommend three separate times to biamp so I thought here must be a reason behind their design.

To be honest I don't follow how you're incorporating the sub or what that has to do with your surround speakers, but I'd still get fewer and better quality amp channels -- just make sure you replace the stock speaker jumpers with decent wire.  To me, better amp quality trumps biamping with a lower quality amp, but maybe that's just me.