Wait...if I'm reading right, your new to paintball. Not brand new, but newer, I would suggest something else besides the 07... Just b/c a gun has a reg doesn't mean your tank doesn't need one. How else would you screw it into the asa. The reg on the tank bring it to around 850 psi. The reg on the gun will bring it to around 200 psi give or take.
Just seems like there are more simple guns out there that would be better.
you wont have any problem with the tank.
However,
Why kill the lightness of the Ego7 by using a 47/3000 steel tank?
on the other hand.
Since you seem to be competent at least a little,
I think you could get an ego.
I would get a less expensive one though like the 2005 Ego or 2006 Ego(05=500 or so dollars. 06 = 700 or so)
i would look into both of those and use the rest of the money for a new tank.