Steroid on 27 June 2009
I would recommend Oblivion GOTY or Valkeria Chronicles in tandem with another cheap action oriented game so you can mix it up.
For me the games with the highest replay value have been:
Street Fighter 4
Oblivion
Little Big Planet
Resistance 2
If you can score them for under $30 try out:
Uncharted
DMC4
MGS4
Motorstorm Pacific Rift
Wipeout HD
Folklore
You can also get many PS2 gems for under 10 bucks these days
God of War 1/2
FF 10/12
MGS3
etc. etc.
