DS lite!!! Even though a piano would be pretty cool (even though i dont have one nor play one

).
why is this hard? getting the friggin DS Lite.
DS
A whole Game > just the music from a game
^this
But a DS doesn't take you anywhere in life >.>
Its a time burner.
Get the piano. You get more out of it.
It could become a career.
It can make you money (playing out on busy streets getting tips, thus getting you a DS) I don't think people will tip you for playing a DS >.>
And if you're parents would be willing to buy you a piano. They should be even more willing to buy you a DS for your good disicion of getting a piano.
After all, it costs less. And you get the money from the piano tips :p
playing a piano in the streets for chump change doesnt sound like a successful career to me. lol
OMG magic this is a no brainer.....get the key bored DUH...i gots me a Roland FP-7 88 key digital piano not too long ago and i love it, if you like messin around with midi stuff, witch im sure you are since you play video game music, you should totally get it digital pianos are awesome to sync up with computers or a synthesizer and well if you do that WHALLA you got yourself a work station buddy, seriously this piano was one of the best things to ever happen to me

..get it DO IT 0_0
OMG magic this is a no brainer.....get the key bored DUH...i gots me a Roland FP-7 88 key digital piano not too long ago and i love it, if you like messin around with midi stuff, witch im sure you are since you play video game music, you should totally get it digital pianos are awesome to sync up with computers or a synthesizer and well if you do that WHALLA you got yourself a work station buddy, seriously this piano was one of the best things to ever happen to me

..get it DO IT 0_0
Roland FP-7 is a bit expensive 
I was looking at a Casio....
But then there's the Yamaha, which is very tempting...
You see why I think this decision is hard (DS or piano), I <3 playing the piano A LOT, and I <3 playing games A LOT. And I don't have that much money. >_<
Hmm... It's really your choice, I understand your predicament. I can't really give my honest opinion unless I've used both of them, which I can't say I have. I'm leaving it up to you; if you're serious about playing the piano like to possibly pursue it as a career, you should highly consider the piano. If you've tried the games on the DS Lite in stores and really enjoy them, highly consider the DS Lite. Perhaps you can get a used DS Lite and a used game AND the piano? Anything to make this decision easier.
OMG magic this is a no brainer.....get the key bored DUH...i gots me a Roland FP-7 88 key digital piano not too long ago and i love it, if you like messin around with midi stuff, witch im sure you are since you play video game music, you should totally get it digital pianos are awesome to sync up with computers or a synthesizer and well if you do that WHALLA you got yourself a work station buddy, seriously this piano was one of the best things to ever happen to me

..get it DO IT 0_0
Roland FP-7 is a bit expensive 
I was looking at a Casio....
But then there's the Yamaha, which is very tempting...
You see why I think this decision is hard (DS or piano), I <3 playing the piano A LOT, and I <3 playing games A LOT. And I don't have that much money. >_<
hahaha yeah, well i wasnt say you should get the FP-7, just get the piano, oh and dont get the casio, casio's are more for beginners and well bye the looks of the music you sent me your no beginner, go with the yamaha, yamahas are usually very easy to use and really sturdy boards, my friend had a little yamaha midi board and she would always drop it from the stand and nothing major would happen to it just a few scratches and dents but it still worked fin, so yeah get the key board....DO IT! ! ! !
Get a DS lite for $90 @ ebay and a cheaper keyboard... Unless you are extremely talented and want to play the keys as your carrier, it's a no brainer, invest in LIFE, it will no doubt pay off in the end.
Edit: Oh, and as a matter of fact I think you can get that same keyboard cheapr, off of ebay.
Edit2: Infact yes, you can get it for about $100 dollars cheaper on ebay, depending on how much the price ends up at the end of the auction. you can also look around there.
finnal opinion: I'd say both. Used things are under-rated these days... when you can have the same thing for much cheaper....