Actually, Shocker style Maxflows aren't that hard or expensive to come by and they can be bought from Smart Parts and occasionally used from people that own Shockers or Impulses with the Maxflow with co2 manifold who have shucked it in favor of something like an Angel a.i.r or Armageddon or bought a new Maxflow nitrogen system. For about $100, $125 or so including the 24 oz co2 tank, you can have a system with the capacity of co2 that pretty much acts exactly like nitrogen with an adjustable output and Maxflow reliability which is on par with or a little cheaper than a basic 68 cui nitrogen tank which between the two with a Cocker it's an even 50/50 split in and of itself. HOWEVER, the advantage really stands out, though, that if you get more money down the road you can just screw in a Crossfire or Nitroduck screw in tank you will basically have a Maxflow nitro system with very little more to pay for. I ran a 114 screw in with my Shocker's Maxflow and it was the same results as using a much more expensive tank but using something I already had paid for.
The choice is yours.