Dockatot: Grand or Deluxe?

Okay, so I've decided to break down and get a Dockatot. My question is, which one should I get? My little one is 2 months old and is considered to be a long baby for her age. Should I get the deluxe or the grand? The grand looks really big and is supposed to be for 8 months and up, but I'd hate to spend so much money on the deluxe and only get a couple of months' use out of it.