Well, OS X is "made to just work" so they include quite a lot of useless drivers and such. So when I got my new mac, I simply reinstalled it while opting out some of the drivers that I'd never use.
Besides, 250GB doesn't mean you'll actually have 250GB. You'll need to take out about 5GB's, even upto 10GB if you have a crappy drive. lol.
Anyways, congrats on your purchase and enjoy your new mac 😀