Gradual progression is totally understandable, and I hate that your girlfriend is with a known gear head and still doesn't support the hobby, but you're situation is a lot different than OP's, who keeps switching between things because he can't decide what he wants.
I gotcha. I just had to vent for a minute and found a relevant thread. I started with a '96 V6, '03 GT, '03 Mach, now I want a Terminator. It's just infuriating that it's never "oh okay sure have at it!" :nonono: