I use a Planet Waves which has adjustable tension on my JTV-69 and it works quite well.
I remember how anxious I was when I was waiting for my Variax; you're going to have a really good time!
I have found that the jumbo frets on my JTV59 cause tuning and intonation problems even without a capo. Unless you have a really light touch (I don't) I think you will notice it. The capo will keep the guitar in tune with itself, but will probably pull it sharp relative to other instruments.
My JTV59 is with a techician right now for refretting. I am having the jumbo frets replaced. I just can't get used to them, and can't play lightly enough to avoid the problem. But don't get me wrong - I love the guitar and I can't wait to get it back with this issue resolved. Nor do I regret/l ament the additional cost. Any new guitar needs a setup anyway; the additional fretwork is just something I need to do to personalize my setup.
You're going to love the JTV59, even if you decide you need to do what I've done.
At home waiting on the big brown truck!
I've played a guitar with jumbo frets for several years now, and I've gotten used to the lighter touch required.
It has become a part of my technique... Sometimes I "want" to bend the note a little sharp for a slight slow vibrato and do so by adjusting the pressure on the string.
Might take some adjusting though when I am playing acoustic models (I tend to squeeze the snot out of my acoustic), but then the intonation on my acoustic has always been horrible.
With the thicker neck of the 59, I'm sure it will take some time to adjust.
I use a physical capo all the time. One I used for a long time is the Planet Waves NS Capo -- a screw type. The one I use now is the G7th Performance Capo -- it's a clutch type -- press it and it stays at that pressure until you let off on its lever that releases the clutch. Another I used for years was the Shubb. All of those are good. I'm used to using capos for years, now. I use the JTV special tunings mostly for down tuning -- drop D, down a half, drop Db, down full step, etc. But for up tunings, I get used to playing a lead in a cetain position, and habits die hard. Never was a fan of the Kysers, and other squeeze on's because you can't adjust the tensions and they go on so darn tight. The G7th is quick, no muss no fuss. I got fast with the Planet Waves screw type, too. You just have to find the one that works best for you. You just make them tight enough to note true with no muffling and no buzzing...