While you can spend a little now and then toss it later on when you want to put larger tires on might sound like a great idea, I have never been a fan of wasting money.
If you're looking for advice on what to get my suggestion would simply save your money now and get what you ultimately want.
So if that means that you have to wait a little longer and deal with the raddling, in my book it's worth the wait. You will see a lot of cheap stuff out there that will save you a lot of money but in the long run, they won't. and talk about raddle now on the street, wait till you hit a trail with that cheap stuff.
Not only will the cheap ones come up short on the raddle, but it will also fail on the trail leaving your spear on the trail, I see the parts all the time out there because I have picked them up, they make good scrap.)
Do your own research, go to the shows, find something that you like, read the good and the bad on the forums, but don't let anyone here tell you how to spend your hard-earned cash.
That's my advice