i dont know of any 10psi 10.5comps off hand i mostly deal w/ i4's, you can make 6psi on tha tmotor streetable, you just have to spend the time.money to get it tuned right.
Your right though over that I'd drop the compression for more streetability. The thing is to ust know what the bottom end can take (wait and let others blow up 1st) adn the real problem with the Zetec motor is just need to add some arp studs and your good, rods if your gonna go for really high numbers.