Well, I'm trying to get into the series. I got the DS game for $20, and I'm thinking if that is a good way to start? I can probably look for the ps2 games somewhere online, and also I can get the Psp one (anyone knows when is coming to the US?)

So what do the experts (hopefully Soriku will get here) say? Should I just start playing 358/2? Or should I get I & II and play those first?

I'd play Kingdom Hearts 1 first at least, 358/2 drops you in without a lot of explanation. Chain of memories for the GBA sets up the 358/2 story.

Play 1-2 first if you can. 358/2 if pretty fun too though.

Play them in order..KH is kinda a story driven series, and if you have no Xxperience with series you will most likely get lost.. KH - COM - KH2 - DS

Kingdom Hearts Chains of Memories sucks, is the worst game I've played, but the first game is fine 9nothing reat, just fine). Can't tell about the others.

This order is what you should play them in to fully enjoy one of the greatest gaming series' ever made:

Kingdom Hearts Re:CoM - PS2
Kingdom Hearts 1 - PS2
Kingdom Hearts 2 - PS2
Kingdom Hearts 358/2 - DS