My suggestion:

New 1" Threaded Headset - black - $20

Threadless Stem Adapter - black $-25

1 1/8" Stem - black - $17

Total = $62 plus shipping

Might be out of your price range, might not be........that keeps all the colors the same as long as you get a black handlebar.



Now, it would be cheaper if you didn't have to have the removeable/hinged faceplate on the front of the stem.

New 1" Threaded Headset - silver - $12

Stem - silver - $33

Total = $45 plus shipping

Personally, thats what I would do.



Annnnnnnnd, if you are dead set on going threadless......

1" Threadless Headset - black - $40

Threadless Stem compatible with 1" steer tubes - black - $20

Total is $60 plus shipping from 2 different companies.

Quick bit of research on the subject shows that 1" threadless is becoming a bit of an endangered species (according to sheldon brown and harris cyclery, anyways)......