[Opinions on using my two unused AVR channels]

I don't have dimensions but here's the room:

 

 

The surrounds aren't in the greatest of positions but the room still has to be functional so I had to put them where I could.

[Opinions on using my two unused AVR channels]

So, here's my current setup:

 

Onkyo TX-NR545 AVR

Klipsch R-15Ms for front L&R

Klipsch R-25C Center

Klipsch R-12SW Sub

Klipsch R-14S Surrounds

 

I'm currently running the basic 5.1 setup with the above hardware and it sounds great. The TX-NR545 has two more unused channels I can use and I'm just curious what the opinions would be for my options. This AVR is only capable of around 45W/channel when all 7 channels are running so I don't want to get anything huge. The options I'm weighing are:

 

Getting new RP-250F floorstandings for front L&R and bi-amping them and moving the R-15Ms to the surround positions.

 

or

 

Getting a new pair of RP-140SAs and going with an Atmos 5.1.2 setup

 

or

 

Getting a new pair of RP-150Ms for front L & R, moving the R-15Ms to the side surrounds, and moving the R-14Ss to the rear surrounds for a 7.1 setup. 

 

Decisions, Decisions. Thanks everyone!