Thanks for the help!
Yeah, shame I'm in Hungary, no local shops (just bowhunting stuff and historical bows), and no other archers near shooting this type (just one guy with 30" 600s).
I usually collect all the needs and money from my friends, and order from foreign shops: Alternative, VBS, Arco&Frecce and now Bowsports...
Then we share the delivery cost.
I have to say, this isn't a common opportunity, and I must have 6 from the same spine, as I don't want to shoot with just 3 or 4 arrows on a competition (I go to FITA Field).
So it's a hard question, 700 or 800.
I think I will buy 700s, and try to tune them as correctly as possible. Maybe it's better to leave them a bit longer, than correct lenght but weak spine, isn't it?