I've also got Optimum stands for my Home Cinema, Hi-Fi and games consoles (slightly over the top the last one, I know), and their build quality and flexibility is second to none.
Like you, I measured up all my stuff based on the height/width/depth principle, and the rod system that Optimum use is just so easy and clear to understand and plan for.
And it's upgradeable too - if ever you buy new stuff that doesn't fit your stand, then you don't need to go out and buy a whole new stand, you can just buy new taller rods.
Genius!
It looks like you've done your homework, I don't see any problems there.
Enjoy!
Derek
p.s. Just been over to this site:
http://www.standanddeliver.com/acata...tv_stands.html.
It's cheaper and I've used them before, good company. Just make sure that you're buying the right depth stand for your needs - Optimum have two types 500 mm (Standard) and 400 mm (SL).