The Ultrasound is very good and you can always plug it's output into a PA if you are playing a loud gig and then use the Ultrasound as a monitor. I have used my Ultrasound for various smaller venues and it is so natural sounding on guitar and vocals.
I have seen used Fishman SA220 systems as low as $500 and it is very nice higher powered alternative to the combo amps you are looking at.
Good Luck!
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Paul
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