what xbox original to download

so the oother day i decided il buy 4000 ms points and dl like crazy. well i got 1200 left and im trying to decided which one to get here are what i narrowed dwn 2

 

Get TMNT 1989 Arcade best game ever.

 

Fable was always a fun game, although the new fable is amazingly bigger and yet the same map! Fable, I've beaten like 20 times, and once in one day. It's a fun game, but it gets boring when you know the storyline already.

 

Get ninja gaiden. One of the most favorite games I have ever played.

 

yeah im leaning towards ninja

 

I never knew u could use ms points to dl original games. Can you dl like halo 1 or halo 2? Also, can you use ms points to buy games? I.E halo 3, or cod 4?

 

Fable is the best game in the world, I don't care what anyone says.

 

It's the best old school xbox game ever. And Fable 2 is the only reason I'd buy a 360.