golfer, I'm glad to relate my experience. It's interesting that you bring up buying a tank. When I had my Impact and RAW with their large bottle capacity and 250 bar fill pressure, I had a 75 CU-FT 4,500 psi tank with a 4,500 psi compressor. But since I switched to the Wildcat as my exclusive rifle, I sold my tank and compressor and went back to using my hand-pump! The WC has a relatively small bottle that fills to only 230 bar. Of course, a tank does make filling more convenient, but I am finding the hand-pump manageable.
Of course, it depends on how you plan to use your gun, If you do a lot of target shooting or plinkin', I would definitely recommend a tank. I am exclusively a hunter. Except for shot strings, zeroing, and ranging (which is once in a blue moon), I shoot very few pellets. Sometimes I go out and never get a shot. (That's why they call it hunting!)