Frankly, if u do not want to spend that much cash then don't. Buy the Zen and be done with it.
Make ur decisions based on ur usage levels, For eg. if you would be using ur player more often at work/gym/train/bus/home/while studing etc.
Sound quality - unless u havent heard either player, u cannot compare.
Features - Look at he features, if there is something in either player which u really need then its a no brainer as to which player to pick.
Go ahead and njoy your purchase, whichever it maybe. and do post back with what you bought.