The Ultra Evolution is a good centre speaker, but my preference is to have 3 speakers in the front that have the same tonal characteristics. When voices move from the left to centre to right, you want the sound to remain consistent. The Opticon Vokal is designed to match your Opticon MK2 and is 25% cheaper. Both the SVS and the Dali are 3 way designs with the tweeter above the midrange, which is good. The speaker sensitivity is about the same (87dB for the SVS and 88dB for the Dali). The SVS, being a 4 speaker design, may be able to play louder than the Dali, but in your 11ft x 11ft room I think the Dali should be adequate as you will likely be relatively close to the speaker.
SVS has a free return policy in many countries. Do they offer free trials in India?