A friend has the 8000, I have the 740. Biggest plus for the 8000 is the volume from the built in speakers. Other than that it has some sampling abilities and up to 3 layered voices. Plusses for the 740: has 4 variations per style and simple endings + groove. Sounds are similar, but the 740 is newer and I feel its sounds and styles have the edge. Unless being self contained in a large room is important to you I'd give the 8000 a miss and look at something newer.
Paul