Heavy grade and stunt yes, I can understand your choice.
If you're wondering what the length's will be. I made a list of all the hilts and added up the blade length so you can compare. Double the size and you've got a good estimate of the lenght of a staff with a flush coupler.
List can be found in one of the last posts here:
http://www.saberforum.com/index.php?topic=4779.90I'm 2.03m, I think that is about 6 foot 7, 6 foot 8, and I can wield a Aeon/Dominix in staff-setup with a 36" blade, but to be honest 32"is way more comfortable.
The Aeon's v3 or v4 are brilliant sabers for spinning, Sentinels come second (IMHO) Balancing them out with a different pommel is an option, good for more easy spinning, bad for your wallet
If you're scared of dropping and breaking you're sabers, and believe me you will, you could think about making a dummy saber out of a wooden staff and some old bicycle-tires. I did that for my students and my own training, so we can safely practice the more difficult spins and throws, without damaging the sabers. I've made the practice sabers in a way that they've got the same balancepoint as a 'normal' saber. If you'd like I'll try and take a picture tomorrow or the day after.
I got the idea from looking at contactstaff-juggling. And made it into my own little design.