I'd go for the 750SS, but... The bike in the pic has had some damage repaired. The faring has been repainted and does not have the original graphics. You can't just pull the original stickers off, as they are under the clear coat. I'd definitely want to know the bikes history as far as crashes or tip overs go. Maybe the original owner just wanted to change the bike and it wasn't damaged. In any case, yes, the price seems high. You could probably find the same year 900 for less money if you looked around. I think the 620 would be too small. Especially it you plan to ride with a passenger.