I have a pair of Monitor 9 V5 in my HT setup and am happy with them. Could I have gotten better for the price? Possibly, but not where I live. They offer great value for the money, IMHO. I compared them in my house with the RTiA7 and returned 7's. There wasn't a whole lot to choose between the two, SQ-wise, but the Polk's cost about 50% more and are less sensitive to a significant degree. So, they would require substantially more power to drive than the Monitor 9's. That sealed the deal for me.
I would certainly encourage you to listen to the other speakers on your list, preferably in side-by-side comparisons. If you can audition different pairs in your own home at the same time, that would be the ideal method - depending on the return policies of the dealers.
With auditory memory being so short and the acoustics of different venues varying so much, listening to single pairs in different stores can make accurate comparisons difficult. Some people might be able to do that, but I certainly won't claim that ability.