Kef/Revel bookshelf choice with amp selection help needed please

Evening...

I’m rebuilding a basement and putting in a home theater area but it’s not a dedicated area. I estimate the main listening position will be between 12.6’ and 14’ while the room is 17’ x 15’.

Through my research I’ve narrowed my bookshelf front L/R choices down to the Kef LS50 compared to Revel M105 or R300 compared to the Revel M106 for L/R fronts. Unfortunately, there are no Kef dealers/resellers in the KC metro (there are 2 Revel dealers so I will check them out this coming week) so I’m looking to the AG community to help me further. I have read that the R300’s might be better for heavy/classic rock than the LS50’s although I’ve come to understand that the LS50’s are stellar for music for the price. I did get to listen to the Revel Concerta2 M16’s last weekend and they sounded pretty dang good for $900/pair.

I picked up a Marantz AV8802 pre/pro here but still looking for a good 3/5/7 channel amp to start the H/T setup.

Amps I’m considering:
Marantz MM7055
Parasound A51/A52 or A31/A23 for L/C/R then a couple Outlaw monoblocks for rears
Outlaw 5000 or 7140
Is balanced the way to go vs unbalanced?

budget - looking $3000 total for L/R's and amp but could extend that a little

No WAF considerations as she is looking to me for the direction as she knows this research has consumed me as of late.

Thanks for your time and consideration!
dwgncat