Give a neutron resistor a try. It’s basically a beefy teebird with a flat top. I’ve had one in my bag for a year or so now and I find myself grabbing it regularly. I think it’s more versatile than a firebird because of its 6.5 speed.
I highly recommend the Westside Sword as an alternative to the Grace. It's more readily available, comes in a much wider weight range (including lightweight VIP AIR), and it's cheaper. It flies very similar to the Grace. The VIP AIR version will be more understable because of the lighter weight. I agree, the SAIL is one of the best discs ever made! Very versatile and easy distance with amazing glide. They can fly 3 feet off the ground for miles.