Well, i though that getting the gas model was a good i idea becasue i already had all the stuff for it. But i am now concidering converting over to electric. What would i have to buy. I understand i would need a new crutch but that is nothing. What engine would i get, brushless, or normal? What battery would i get? What speed control? What pinion for the engine?

I would like to avoid buying a lipo battery and charger also

Not going to work then. The Corona really needs brushless to get it moving, but doing an electric conversion without li-po isn't going to work well. Without li-po you wont get the power or runtime you would successfully need to get anything good performance wise.

I disagree with that. Performance for me has been fine with the stock 7-cell 3500 mAH NiMH battery and Mega 16/15/3/CC 45 Amp motor/controller combo. This gives me 10 minutes of hovering or forward flight. I don't think LiPos are necessary at all for the Corona. I use 2 6-grips, which extends battery life at the cost of some stability.

So I guess in full reply, based on what I've got:

Mega 16/15/3
Castle Creations Phoenix 45
7 or 8 cell NiMH (8 cell will give you more power/time, but must be slung under the crutch with JR landing gear)
Cheap batteries: http://www.all-battery.com/index.asp...rodID=540&HS=1
Dean's Ultra Plugs for battery/ESC connections
9 tooth pinion
Glitch reducer (search for it on helihobby, don't go electric without it)

Bear in mind that all that will cost you ~$250, plus all the parts you'll need (crutch, etc.)