I'll at least need a reverb pedal and a drive pedal.
I used the Mosky Spring Reverb with mine until I splurged on a Keeley Caverns. Other cheap alternatives if you want a larger variety of reverbs are the Cuvave (now ChiliShark) Dig Reverb and Behringer Digital Reverb.
On the OD, I recommend a Rat clone so that you can get kind of a best of both worlds of overdrive and distortion. I don't really care for a TS type with this amp, unlike with other Fender-ish amps. I also use a compressor with a boost sometimes, especially for slide playing.
Another inexpensive pedal I recommend with it is the Trelicopter tremolo.