You're describing using the amp as a monitor, i.e. it's your personal amp and it feeds the house PA. This is a perfectly normal way to use such an amp, but the Behringer is no good for that because it has no signal output at all. Micing the amp isn't really a good option for this.
If this is important then you have a couple of choices:
1. Ignore the Behringer. Or at least ignore the ACX450 - the ACX900 has stereo DI outputs that will be perfect for the job of feeding a PA. But many other amps have an output that will do the job.
2. Get the ACX450, but also get a small mixer for the coffee house scenario where the mixer can be configured to send the main output to the PA and a monitor / control room output to the ACX450.
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