IMO the GC techs are good enough to iron the kinks out of an inexpensive bass. Lots of us on here do it ourselves, a basic setup isn't rocket science. Even better, google "guitar repair"...depending on where you live, you'll likely find some competent guitar techs who can do a great setup.
You don't need a setup before you play it or anything, but I'd highly highly highly recommend getting it checked out by one of these folks ^^. Little adjustments can make a huge difference in the playability of an instrument, and you want to start with a bass that's as comfortable to play as possible.
Get the best bass you can afford, a CV or a MIM(or 20 others in that $400-600 price range) is absolutely great to start with, and get the pro setup. You'll have a quality, comfortable, playable bass and that's a solid place to start from. Good luck!