The Getaway is not as deep perhaps as Funhouse,but its way faster and a bigger rush.
I've only played Funhouse on the Wii with the excellent Williams Pinball Hall of Fame, personally I find Rudy slightly too creepy and the game too stop start. But it's definitely horses for courses. So maybe try before you buy. Bride of Pinbot is a cool game but if it's your only table it might get old fast.
If you dig Funhouse go for it, otherwise why not go for one of the cheaper ones and start putting the savings towards your second... It's surely just a matter of time