Cubmaster Good luck with the Rex, you won't be disappointed I know I love mine they are just such a fun heli. I would not get spektrum servo's though unless they came out with a new one that I don't know about I think one of the best for the Rex is still the Hitec 65MG but I could be wrong. There is at least one site that will put together a custom trex package for you but I don't know there reputation with customers as I have never bought from them. If you want a good company to deal with check out Heli Proz there is a great bunch of guys and gals and I am not just talking BS I have had great customer service every time I go in the store, and I know there online and phone service is great also. Links below to both stores though.
Can't think of one thing you need to know they are a pretty solid heli and handle good, one thing I guess use the fly bar weights until you get use to the heli. From your other post I am guessing have flown other heli's so you don't really need the weights but they do help a lot. The only other thing I absolutely recommend is the Micro Heli gyro mount its a great way to mount the gyro out of the way.

http://www.helihobby.com/html/t-rex_ccpm.html

http://www.heliproz.com/

http://www.microheli.com/product_inf...roducts_id=337


OH by the way how much, what size, and who made the Yak54. Like I need another plane