Matching Koetsu Stone Body Platinum Cartridge

I'm considering upgrading from my Lyra Delos to a Koetsu Jade or Onyx Platinum. I really like a silky smooth sound, but listen to a lot of rock and want solid bass.

From what I've been able to read, it sounds like the Koetsu stone body carts would be a great fit. I may even spring for the diamond upgrade given the (mostly) great things I've read.

Unfortunately, I won't be able to audition this cart, so I'm relying primarily on reputation and what I've read. Not ideal, but I'm ok with the risk. I just wanna make sure these carts are a good match for the rest of my rig.

Here's what I'm running:

Brinkmann Oasis with Graham Phantom Supreme II
Shindo Vosne Romanee pre-amp
A23 SUT
Shindo Lafon gm70 monoblocks
Shindo 604 Altec speakers

Obviously I'm most concerned with matching the table, arm, cart and SUT. Any insight on whether this would be a bad, good, great or stupendous match?

A few more questions...

Is the diamond upgrade is worth the extra cost?

What are the sonic differences, if any, between the jade and onyx differences?

Finally, what is a realistic turnaround time these days from order to delivery for someone in the US?