I have to order servos for a Carl Goldberg Ultimate biplane. I have a Futaba 7C 2.4GHz radio. If I plan on flying it aggressively eventually, what type servos should I order?
Are [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXHKB0&P=ML]digitals[/link] overkill for a setup like this? Any disadvantages to the [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&W=001615334&I=LXVW07&P=K]standard[/link] servos?

I also don't know how many servos I need. I bought the plane used and it has aileron servos already inside the wings. I need all the rest of the servos. I'm thinking three - one for throttle, one for rudder/tail wheel and one for stabilizer, right?

Also, is there any alternative to using a Futaba receiver that's less expensive?

Sorry if these are stupid questions but I really don't know and could use some advice.

Thanks in advance.