My UCANDO is here!!

So now i have a few more questions. My Somethin Extra bit the dust last week so I am planeless. This is the second week of the season here and I am dying to fly. I need to run to the hobby store tomorrow, but none of the LHS's around here are very good. I need to decide how to set up my servos.

I have a Futaba 6exa with th3 4.8 battery, 4 3004 ball bearing servos and some spare s3003s laying around. I figured i could use a 3003 on the Throttle. That leaves me with 4 s3004s and 1 3003(non ballbearing). I dont know if i could find a 90 oz servo around here (can drive an hour to maybe get one) and dont know if my wallet can afford one.

3004s and 3003s both show 44 oz with the 4.8 or 57 with the 6.0

Should I:
1. Get a 90 oz Servo no matter what i have to do.
2. Put 2 3003s on the elevator and use 1 of the 3004s for the rudder.
3. Put a 3003 on the rudder (I am really just going to be sport flying it for now).
4. Any combination, but get a 6.0 V battery to get more torque.

Also i am going to try and get the 6exa to do the Ailevator so i dont need a reversing y harness, will this work, best method?

If i am going to fly Saturday i need to go to the hobby store tomorrow, any help will be greatly appreciated.