Puritans!

It's fun, and they work, but I wouldn't suggest that you sink a lot of money into a fancy rapid recharging reg. It's just not that important.
You should be able to find something for around $30 that will handle all that a Phantom needs. I like old WGP Autococker regs. They are not expensive, can handle CO2, and most will deliver the higher operating pressures that you need.
A reg is only useful with CO2. Not worth it with HPA. It will keep you shooting at a consistent operating pressure all day. That is useful at the chronos, or if you get checked on the field. It is useful for accuracy with CO2 no matter what kind changes in the temp happen during the day.
Don't let the "purists" spoil your fun. They add bling and little more "mystery" to a pump that is already a little odd at most fields. People will spend hundreds of dollars on a "quad flip flop" ano job that doesn't do squat for performance, and then get all worked up over a regulator!
