Hi there, I've had several acoustic amps in my time, here are my thoughts.
Marshall AS50R (older analogue reverb) and AS50D (digital reverb) I prefer the newer AS50D as I felt it was a cleaner sound and reverb. Very nice amps, very reasonable price and often come up for sale second hand.
Marshall AS100: More inputs, very loud but I found it much too bright and couldn't tone it down. It's also very heavy and cumbersome:
Ashdown Acoustic Radiator 1: Quite small and light, quite a nice sound. You might find one used...
Laney A1: Didn't like the sound of it and didn't keep it.
I've tried the AER amps and thought they were way overpriced but they sound good. I've tried the Roland ones too and found them quiet and too polite sounding.
The best of the bunch for me is the AS50D. It's an excellent price compared with most other acoustic amps. It's not super light but has a very good sound.
If you're playing in an acoustic group, the other option is to invest your money in a nice portable PA such as the HK Audio Nano 300 or 600 series.
I haven't used acoustic amps for a while, there may be better options available these days.