Optically the Mark Vs are my front-runners. My concern is whether or not I will tire of constantly changing out the Glasspath Compensators. I know there can be some minor vignetting issues with the Power Switch, but the convenience of being able to change magnifications without switching configurations or getting up from the scope to change eyepieces is very nice.
You can always use a Denk PowerSwitch with your Mark Vs. Here is how I did it...
Eventually though, I was not totally happy with the Power Switch's low power setting so I got a Siebert 1.3X Multi Mag OCA and a few more bino pairs of eyepieces. I also tested the 1.7 Newtonian Glasspath Compensatoer but at 1.7X magnification, the less amount of wide view was not working for me. I now just change eyepieces and the 1.25x Glasspath Compensator stays in the Mark V's for the most part. The only time I remove the 1.25X Glasspath is when I need a little less magnification. At first I thought that it would be a pain in the rear end but it's not too bad once you get used to it.