i'm not sure how helpful this will be...but i just got a nurian x13 off of gmarket.
it was about 142,000 won.
i just got it yesterday, and from what i can tell, here's what i love about it:
-eng-korean, korean-eng, japanese-korean, korean-japanese, chinese-korean, korean-chinese
-menus are easy to navigate
-you can easily input words by via typing or writing
-you can input different types of media--mp3, photos, ebooks, video, etc.
--but you may have to do this through the korean software CD it comes with
-i feel like there are not so many example sentences and phrases
(i sometimes feel like my phone has more examples)
-short battery life--although you can easily charge it via USB cable
when i went to yongsan and technomart, this is the model they pushed on me right
i'd be curious to see how a Sharp dictionary compares. I have an electronic Sharp dictionary that I used while I was in Japan, and it was great! there were tons of example sentences.
it's really fun to have a fancy color touchscreen dictionary...but i think next time i'd buy something more basic.
i hope this helps.