building a 7.X Polk RTI A setup

[MADNOD]

Dear all,

i am considering a polk RTIA based setup.

my room is 18 X 24 X 11,

option 1: 2X RTI A9 , 4X RTI A1 , CSi A4 ( all have 5 1/4 drivers)

Option 2: 2 X RTI A7 , 4X RTI A3 , CSI A6 (all have 6 1/2 drivers)

AVR will be most likelly something in 110 W per channel.

on the sub which will be better, 2 PSW 125 or 1 DSW Pro 600?

i am not living in the states so ED is not an option.

so what do u advise?

my main concern is the dynamic range of the setup not power (even thought the 2 options are powerfull enough)