Steve Good Decision get a good pair of Powered Speakers I have several sizes if you look at the QSC K 8 I have had a pair of these for 5 years and prob 2000 gigs on them and they still sound as good as they did the day I got them .

I am looking at a line aray system as well but canceling the Roland Amp is prob a good decision .
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Genos, PSR S970, Fender Tele Amercian Deluxe Cherry sunburst , Cubase Pro 8 ,Yamaha A3M Acoustric ,Taylor 814, Ibenez Artcore Custom Tascam DP 32 Yamaha DXR 10, QSC K-12, K 12 Sub K 8 Sinn 945
2 Fender Expo line units .