Hi Piyush, you have a lovely room. For 17feet hearing distance you may be able to get away with av receiver without power amp- provided you are selecting a high sensitivity speakers.
What are your sources - like Airtel Xtreme or blue rays ?
What volume you will listen to ?
R u planning as HT only or do you listen to music also ?
and the power rating of Avr is different from amps-
If Avr states it is 100 watts- it usually means only when 2 channel driven at 8 ohms
When all 5 or 7 channels the wattage is much less say around 50 watts in 8 ohms load
For example - Marantz sr8012 flagship avr- watts stated is 140 - when only 2 channel driven -
When 5-7 channels driven it's 70 to 90 watts
Despite it having a huge toroidal transformer.
Meaning all the other budget receivers would be giving much less wattage.