I gotta agree with you cassp...the Yamaha plastic cabinets aren't the most robust you'll find, but it does keep them very light, and my old 3k went through countless gigs and rigorous home playing and never gave a hiccup.
As far as the cheap plastic looks, the audience doesn't care as long as you can cook with it and make them happy.
Through a good set of speakers, most of the mid and TOTL arrangers will sound great...it then boils down to an OS you can live with and a weight/size you can tolerate for your type of gigging schedule.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.