I have the Sony X1060 and don't think it's heavy at all, a fair bit lighter than my previous Zune 80.
With your music mate, try using MediaGo, it's far better than the supplied software and MediaMonkey is a lot better as well.
Sorry to high jack the thread slightly but can anyone suggest an alternative to the ipod classic 160gb? Can't seem to find anything that is close to it price/storage wise but i don't want to own an ipod really..