1] "Scale" plane is not what you need. You need a "Trainer". Maybe you are not aware but "Scale" and "Trainer" are two entirely different categories.
2] How cheap is cheap? What is your expense limit? Keep in mind you will need a motor, radio system, and all the misc. accessories.
3] I don't know of any trainers that can be upgraded. Maybe others will know of some.
4] My personal favorites are the Sig Kadet airplanes such as the Seniorita, Senior, LT-40, LT-25, Kadet Mark II.
ORIGINAL: IkI
Well, i'm new to planes, and i'm totally blank minded of which plane I should get. As many of you guys may have played with planes for years, I'm need some help on which plane shall I get first, remembering I'm a beginner and new to this rc catergory.

However, I would want it:-
- A small scale plane.
- Cheap.
- Can be upgraded and replaced with systems and parts.
If possible, can anyone give me some suggestions and examples (links), of my wanted plane?