Unless you must have the MK 1/2 look, i'd just wait for the inevitable UMK 3 Reptile. I wouldn't be surprised if he was the next figure announced.
I already have Reptile, Goro, Shao Kahn and Baraka and plan on getting UMK 3 Scorpion and Sub Zero, Raiden, Motaro, Cyrax and Sektor...so if I can get those plus these 7, I think I'm pretty much done...
1.Kano (MK 1)
2.Kung Lao (MK 2)
3.Johnny Cage (MK 1 or 2)
4.Shang tsung (MK 1 or 2, prefer 1)
5.Kintaro (MK 2)
6.Liu Kang (MK 1 or 2)
7.Kabal (MK 3 with alternate scary head!) ...