best started gun you can get in my opinion is a PMR. any PMR from the 07 to the new reflex will be perfect. nice shooting, easy to clean and maintain, very reliable and will be a gun you can compete with at any level without the need to upgrade anything. I had an 07 pmr and played with it for the best part of two years, not one chop, very few barrel breaks and NO serious problems whatsoever.
couldnt reccomend it enough.
as for the halo, thatl do you fine and the tank will do you fine as well, however you might want to look into getting a fiber wrap tank as they are far lighter and it wont be long before yure fed up lugging around a huge chunk of steel on the back of your marker.