Yes.
no
Unfortanatly you can NOT do that because the PSP is more then the Nintendo Ds and they are in diffrent companys. Sorry
Yes you can, many places will give you a PSP in exchange for a DS, and a sum of money to cover the difference.
your choose
No. because the PSP costs more. But you can probably trade A Sony PSP for a Nitendo DSi. =] yes actually you can you just need extra money
No, PSP games should be played on a PSP and DS games should be played on a DS. I dont think that the DS can take the PSP graphics and the resolution.
You can get sims castaway on both PSP and the DS
I think it's better for the PSP because I have it for the PSP and my cousin gas it for DS and PSP and he said the PSP is better.
psp
the psp
PSp