A 2000mah battery is fine if you dont mind charging the rx battery in the plane at the field after 2 flights or so. With 10 servos, some of them digital, they are pulling a good deal of juice. If any of them(and usually more then one) start chattering, they start consuming even more. I dont think you want to risk a nice $1000+ airplane to a brown out shutdown of the rx due to the voltage dropping below the rx's failsafe level.
yes a 2000 will work, but how many planes has anyone flown with 10 servos in it and been able to fly more then twice before the rx battery voltage gets dangerously low.

I have the H9 1.50 P-51 and it also has 10 servos. I run a 6v 2700mah battery in that one and can safely fly 4 flights in a day without charging. Anymore then that, and the little charging chack with the led lights goes to yellow instead of green.

My advise, why risk a high value plane over a difference of maybe $10 for a battery size.