That can be quite a large budget or it might be just enough!
what makes a big difference is how much and how well you shop as well as how you operate. with some time, effort and shopping for wise choices, one can get in at half that budget. however, if you want bright, shiny and already put together, that amount may be okay.
It gets down to the bells and whistles and how much you want to be involved personally versus getting one "off the shelf".
Easy way for 400+?- one can get one built by some of the forum folks. For less money, one can buy from the auction and screws the various parts together.
How do you fly on those?
My way? I go for a new "beer reg" picked up from a local brew place at about 60 for the reg, shop for solenoid (20) needle valve (30 and DIY a reactor to fit the tank. I buy used CO2 tanks ( 50-75) and do the swapping at local welding supply for the cheapest gas and refills. I don't need shiny as I hide it under the stand anyway!