I originaly had a Invert Halo 2, got shot bang on in the middle and smashed the front to bits so ive kinda gone off them also looking for something which is quick to disassembleIf you're playing tourny, then a rotor or spire. Spire wins hands down for me - easier to disassemble, lighter, smaller profile, wider feed. Rotor wins on battery consumption though. If you can then spend the money on a spire.
I started with an old Halo B V35, which could still keep up with my gun in any situation. But replacing batteries and taking the ting apart was an absolute pain. Look at it as an investment, a good loader will see you through many years of paintball if looked after properly!
My main hopper choices were Z2, Rotor and Spire but hadn't hear the best things about the Z2Both excellent. Spires are a tad more expensive but some people will argue that they are heavies they are superior.
Personally the limit in tournies is 10bps so any hopper will do really.
You have a vast choose:
Spire
Rotor
Prophecy Z2
Reloade B
Magna
Halo
Vlocity
He'll even a revvy or an egg will do the job for a few quid.