Since I typed this post I'm now edging towards a .22 Cal. Prosport. I find the calibre on release to have a more "laid back" sort of effect as opposed to the urgent "snap" of the .177 and I can't deny it somehow.
Another pulling factor is that AA didn't produce the PS in a left handed version for many years so as now they do, I'm preferring the Prosport.
As for the TX, maybe someday a long barrelled version will come along one way of the other but I'm in no rush !