Other than weight it makes no difference in my opinion, others may say yeah it is a massive difference, but as a start up set why get the glitziest thing going? Put it this way, if you had for example £1000 for a brand new all singing all dancing marker, you then go and play a couple of days, find out that you dont like to play, cant afford to play etc etc. Either way that new gun that has had a couple of thousand balls though will be worth about half price , just look at the prices for geo 3's on here then look at any one of the forum sponsors!
I found a good youtube vid about budget balling. Search "techpb budget balling 3.0" he has some really good views on what to get plus he does a run down on markers in your range.
Also this is just my views. I am sure others have other views