Depends what you want to do. I have a Boss RC3 which is a great basic pedal with loads of recording time and 99 slots so it's great if you want to have a library of loops.
But the looper I use most often is the Digitech Trio+ 'Band in a box' pedal. This is brilliant for playing with yourself (ooer missus) as it creates a bass line and drum accompaniment from a chord progression you give it, then you can loop and overdub a separate accompaniment and noodle a solo part over the top. As you can imagine, without being able to play with anyone else I'm using it an awful lot at the moment.
