I have an SWR Basic Black 1X15 w/horn bass combo amp (discontinued). I have used it as an amp for an acoustic guitar and also for keyboard. I don't think there's much difference between it and the SWR Strawberry Blonde (1X12) - except for the additional features that make an acoustic amp so handy, like mic inputs, multiple channels, effects, etc. - sort of like a mini-PA. If you're going through a PA anyway, and you need an amp to use as a stage monitor, I don't know if you really need all those features. But I do recommend the Basic Black as an acoustic guitar amp - if you can find one. When they come up on eBay they're usually reasonably priced, but you can't be sure of condition, especially the speaker. It also is a really nice sounding bass amp, more "old school" than modern, with a decent effects loop and DI, so it can be used as a single-amp solution for a lot of situations. It's just not loud enough for some bass gigs at 120 watts (or 160 with an extension 8-ohm cab), but it does have some surprizing muscle for such a small rig, especially with another 1X15.
The guitar/keys player in
Hadicus Road used to use a Hartke 2500 through a 1X15 and 2X10 for his keys and acoustic guitar because he wanted the clean headroom, while still playing electric guitar through a 38-watt Dr Z 2X10 rig - at least until he realized that nobody was going to help him carry all that extra stuff.
