Personally I think you should contact GeePee and ask him which of the following he still has:
Anime Freak vol. 1
Team Innocent
Lunatic Dawn
Angelique Special
Dragon Knight 4
Angelique Special
Anime Freak vol. 3
Blue Breaker
Dokyusei 2
Sotsugyo II
All of these titles are 10-35 dollars (one is 35) from GeePee.
All of the RPGs on the system are good if you like RPGs:
Angelique Tenkuu no Requiem
Blue Breaker
Boundary Gate: Daughter of Kingdom
Der Langrisser FX
Dragon Knight IV (18+)
Last Imperial Prince
Lunatic Dawn FX
Makeruna! Makendou Z
Miraculum: The Last Revelation
A lot of the "Adventure" games are also good:
Blue Chicago Blues
Detective Ladies (Ojousama Sousamou)
First Kiss Monogatari
Galaxy Fraulein Yuna FX
Kokuu Hyouryo Nirgends
Return To Zork
Team Innocent: The Point of No Return
Tenchi-muyo! Ryououki FX
And these ones are Expensive, but you will want them:
Chip Chan Kick! (GeePee has one for $110, very cheap)
Kishin Doji Zenki: Vajura Fight
Ruruli Ra Rura
Super God Trooper Zeroigar
You will also want:
Power Dolls FX
Farland Story FX
Battle Heat
Tengai Makyo Karakuri Kakutoden