Lucajames, I can not really compare the Gavia to models from other competitors but I am very happy with it. It is a jewel to look at, and the new motor controller which was introduced some months ago made its sound even better.
Nice system, your amps and preamp are very good. I've not heard the Rethym Saadhana's, but I imagine they are a good match for your 845 S amps.
I have the Modwright stand-alone phono stage, the SWP 9.0 SE, which I have upgraded the power supply on, it was supplied by Dan Wright, that made for a nice upgrade.
I'd love to have your tonearm, a friend has one that has a Dynavector XV1-S cartridge mounted on a Transrotor Fat Bob. This combination is as good as anything I've heard, you might condsider trying the XV1-S, it makes a great combination with the TriPlaner.
Looks like a very nice system! As a fellow Galibier owner, I certainly approve of your choice in tables. How long have you been using yours? Did yours come with the new motor/controller?