Forget a half cage if you're thinking about rallying, full cage is the only way you want to go.
Get good harnesses, seat, helmet and a HANS device.
What ever car you buy, buy two of them.
Don't get anything with bigger than, or smaller than, a 15" wheel.
Find something with VERY long shock movement.
And lastly remember... Lots of fun!
And Zeb the other reason that cordia didn't get off the ground is the engine fell out of it...