Scion is a great tank but not really worth the extra $$ since you already have a detonator reg on the PIMP. Go with a HP crossfire 68/4500. I shoot +/-1 all day now that the PIMP is broke in. The scion would not help that much.
As for loaders what every one else said, reloader B or V35HaloB. Or if you play front and don't need a ton of paint, go with the Q-loader for faster ROF, quicker reloades and lower profile. Plus the whole shoot sideways and upside down thing.
Get a reloader B (faster than halo and i like the sound activation better than the eyes on the halo) and as for the tank it depends on ur $$ situation. Get a crossfire if u want a preset, or get a scion if u want an adjustable.
Well, if u only want to spend $80 on a hopper then you have two choices, the egg or the ricochet. I used to own an egg and liked it alot. It hold alot and feeds pretty fast. (besides, the ricochet is ugly)