Loopers?

I've been intrested in a looper, something to practice with, nothing huge. I have a few options, just wondered which you would recommend.

Jamman:
http://www.musiciansfriend.com/product/DigiTech-JamMan-Looper-Pedal?sku=156600

Boss:
http://www.musiciansfriend.com/product/Boss-RC20XL-Loop-Station?sku=151352

Or should I hold out for the new fancy Line 6:
http://www.musiciansfriend.com/product/Line-6-JM4-Looper-Guitar-Effects-Pedal?sku=150498

Right now I'm leaning towards line 6, because from what I've seen, all their stuff has a ton of incredible features. Any opinions are welcome!

I have the Boss RC-2. Easy to use - You can enhance it's capabilities by adding an external pedal like the RS-6. It has almost all of the features that the RC-20XL has. (and the price is alot nicer too!)