Pedal suggestions for solos

[Dark Eyed Junko]

In my solo set, I'm starting to venture into using a looper (Boss RC-20xl) for capturing a verse on guitar that I can later do a solo over. I figure there should be something to set that second guitar apart from the first, so I'm looking around at pedals.
At first I was thinking a little digital delay (e.g., DD-7). I was even thinking of just using an A-B switch (e.g., EHX Switchblade) to send the soloing guitar to another track on the mixer and pan/EQ it differently from the first.

I like to keep the sound pretty acoustic, so I'm really just looking for a little color rather than some mind-blowing effect. Also, it should be a small pedal (again, like the DD-7, as opposed to the bigger DD-20).

Any suggestions are much appreciated.

I'm currently playing a Martin DCX1E through a BBE Opto Stomp, said RC-20XL, and an Acoustimax.

[Mel]

I use an AB switch as you suggest. I utilise 2 of the 3 channels on my Carvin AG100 with the EQ and level set independantly on each. Then using the AB switch I can change channels and sonic flavour just as easily as a channel switching electric guitar amp. I find this very useful in my band .
mel

[ukejon]

Guyatone MD 3 Micro Delay.....amazing little unit that can really add nice tonal variation and depth to solos.