Donny, is that a spare PSR you are trading?
I've got a feeling that if you didn't like the G70 after a few weeks, you are going to find the E80 similar in several ways (the sound is a BIT different, but the OS is essentially unchanged) and the weight is even higher! There are only a few more styles than the G70 you tried (they are good, but not earth-shatteringly better than the G70 ROM styles), and a couple of new OS features, with text-to-styles being the only one I fell REALLY useful...
Given your habit of trying arrangers out, and then going back to your familiar PSR3k, personally, I wouldn't trade in your main axe until you are SURE this is it.....