Which is better a powered 15" speaker or the Trouper for a solo artist with guitar, pedal and microphone?

I'm looking at putting together a bare bones PA and am leaning towards Alto products. I like the portability of the Trouper, but it doesn't have phantom power (not that I need it now, but just thinking down the road). I'll start off with a 2 or 3-way system and probably add a small mixer for reverb, etc. for my voice.
So should I go for a 15" because of the bass response, or will the Trouper do just fine. The end result would be my guitar/mic into a small mixer and then to the right speaker.
Or would the mixpack do the trick?
Thanks for your help in advance gang!
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