I need a looping yoyo.What should i buy

Well there are a couple of options here.

-The Raider, which is best modded
-The Sunset Trajectory, will work out fine.
-The Loop 720, which has a unique string response system.

I managed to actually put these yoyos in an order og gap size. The Raider does have the largest gap stock, but people using these tend to crank them down to a narrow gap. The Sunset Trajectory has a bit larger gap than the 720 and the string response does stick out a good bit.

Addment: I have no major experience in loopers, so go with the experts: http://www.freewebs.com/2amaster/2ayoyos.htm

Yomega Fireball or YYJ Sunset Trajectory NXG.