kopstudent89 on 13 August 2012
Let me put it this way: if you were a big KH junkie, this would be a tough decision.
If you're not at all invested in KH, but just curious about it, go to your nearest retailer right this second and pick up Kid Icarus. You can always borrow KH from a friend later or get it in a few years when it's a lot cheaper used or something. Uprising is a must-have for any 3DS owner.
Also KH is more likely to get cheaper than a Nintendo product.