i need your advice guys as i am thinking about buying a DS light + R4 revolution + 1GB memory = 255 $

i own a PSP and while i do want to play some games, it' s just not enough , may be i' m still underestimating the DS specialy since i own a PSP, i want some fun games not console games on handheld and thought hat may be the DS will offer me this. However, check out reviews does not give good impressions, it seems like there only very very few awesome titles , such as mario, castlevania ... but i would love to pay the next zelda.

so what do you think, does the DS delivers a really good experience or should i save up my money for soemthing more interesting ?