Is TSI worth the extra $ over Polk Monitor Series Speakers?

[mugupo]

I am replace my 9100thx onkyo speakers, i come up that i see a lot of good discount deal in polk monitor speakers like the monitor 70, 40 and cs2, is tsi 500 or 200 worth the extra (nearly 50% more) was consider BIC PL89 at first, but price is like $1400 for 7.1 set up while the tsi 500 and tsi 200 set up would be like $1700 but the monitor 70, 40 and cs for 7.1 set up is like under $1100.