I have not wished I had the 150 but there are many here that have the 150 with M22s and they say it matches perfectly as well, If the size of the speaker is not a factor(WAF) then I do believe the 150 might be the better way to go for you, as you seem to be trying hard to avoid upgrades and those that have heard the 100 and 150 do say the bigger one is a little more dynamic, as expected with the bigger driver array and enclosure. As I said you really can't lose.
Dipole surrounds won't compare to the quad firing QS series and I hope there is someone near you that can give you an audition, Axioms really are as good as the reviews.
