I'd still say "get a good car," but not "get a fast car."
Since you like customizing, I trust you've heard the theorem of diminishing gains, right?
If you get a Ford Falcon, you'll get a thrashed, used-up, and basically destroyed car. Add to that the starting costs, insurance, increased insurance bracket, and the "I can't hide my stuff from insurance adjusters" aspect... You'll be paying way too much on a learner's.
But, if you get a slower, cheaper car, modifications will make it faster. Get a car like a Subaru Impreza, or a Honda Civic, because they're cheaper and easier to drive (I can drift my Impreza, barely, but I'd spin a Falcon and I know it.)
So, you want to modify it; modify it. Start with a big, comfortable, slow car, lower it, install some bolt-ons, put some nice rims and tires on it, and eventually it'll be a nice car for a lot less than your Falcon.
The first car I learned to drive was a Hyundai Accent;

. I then learned on another Hyundai Accent

before getting an Impreza wagon

It's an awesome car.
But, here's the thing; you sound like me, a bit. You sound like the sort of person who wants a reliable, fun, fast car, with lots of space and utilities. My Subaru (2005 Impreza 2.5RS wagon) fits that bill. I can tow my racing kart, with a toolbox in it, go to autocross events, get through 34 cm. of snow, and still drive it daily back-and-forth to work.
So far, all I've changed is the catalytic converter (was bad when we got it) and spark plugs/wires (were bad when we got it.) Other than that, she's running great (all fluids changed regularly,) even with the tow hitch and trailer (for summer use only.)
So, if you want to spend more money making your car incrementally faster, (i.e. taking a fast car and trying to make it faster) go for the cars you were thinking of before.
Or, if you want to stand out, make a slow car fast (Impreza) and still have space for a full family of 4 + dog, toolbox, and racing kart, get the Impreza wagon. Or, for that matter, any car that starts out slow and comfortable.
Last tip: Don't try to deal with FF, they're harder... so much understeer in Hyundai Accent.
