Deppending on what type of baling your planing on doing deppends on what you can look for.
I've had a mag myself and can speak highly of them, but I had to really go electro with my impulse.
You could get some 2nd hand cockers on the forums for around £250 and even if you got a cheap one, you can upgrade them into anything you want, so that could be the best route if your going tourny.
If its for rec then you wont want anything to high spec since you might not be allowed to use it at your local site.