Yes there is a difference between the 2.  The Total NV has a traction coverstock of 0.30, the next in line is the NVS has a traction 0.39, and the Complete NV has a traction 0.45 cover stock.  The are Rg's are the same just different coverstocks.  I believe you could do godd by getting all 3 of them and drill them accordingly.  The NV will give good length with good carry.  The Nvs will start up fast while you still get length you can play this better in oiler lanes.  The Complete will do the same as the NVS but will start sooner and allow you to play in oiler longer than the NVS.  I have 2 of them  right now and the Complete on order.  I have been averaging about 215 - 220 with the NVS and have shot three 700's with it so far.  I love the NVS I would maybe get that one first.

That's honesty.  I think that for a league bowler such as yourself you have 3 too many balls already and you don't need a 5th unless you need to move up in weight.

Based on what you're posting, I am led to believe that you are very enthusiastic, but you have the wrong mindset.  The flashiest equipment won't knock ten pins over; you should work with a coach (as I do) to improve and you won't believe how much further you can get.  I also feel that if you're 17 (are you really 17?) you should be throwing 15lbs (unless you have a psychical handicap).  Good luck.
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I got a sixty-nine Chevy with a 396
Fuelie heads and a Hurst on the floor
She's waiting tonight down in the parking lot
Outside the Seven-Eleven store

-Bruce

15lbs is not really important, at 14lbs you have the core and hit so I say don't worry about it after you are at 14.  I would agree that at 130 there is no real need to buy A) a premium ball and B) a 5th ball if you are going to continue use of the rest.  My suggestion, is grab a Blue Vibe, you can leave it in factory finish for a great all around ball, or sand it down just a bit to have a ball that is more aggressive than the Ebonite NV series up to this point.