Hi KG,
If you want make bigger your pack I suggest you the following titles:
Catch 'Em
Cisco Heat
City Defence
Classic Board Games
Cliffhanger
Cloud Kingdoms
Cluedo: Master Detective
Combat Air Patrol
Combo Racer
Corx
Cosmic Bouncer
Cosmic Space Head
Crack
Crack Down
Creature
Curse of Ra, The
Cyberblast
Cytron
Fifa International Soccer
Fighter Bomber
Firehawk
all are available in SPS version.
I think they are enough to keep you busy
, however these are only suggestions. Thanks for what you can add from here.