How to start racing, Karts the way to go?

I went to Indy a couple (few?) weeks ago and now I want to go racing. I've autocrossed a few times and done very well. However, I want to get on a track and race other drivers wheel-to-wheel (I'll do a driving school or two as well) and can't afford a separate race car.

It seems to me that Karting would be the least costly and easiest way to try racing and see how it goes. In the past I've jumped into things without researching first so I thought I'd get some opinions this time around.

What do you all think? Is Karting the best way to try racing or am I missing something better?

Thanks,

Yeti