@Crossloper I wouldn't advise you to purchase the ps 1 versions of Resident Evil and Silent Hill, every time I have tried playing earlier versions in the series they were always very disappointing. Also you would need a ps 1 memory card. I would recommend purchasing Silent Hill 2 as opposed to its earlier incarnation, and would recommend Resident Evil 4 in favour of the original as its probably one of the best games available on the PS 2. I would also reccomend the following:

Mercenaries

Time Splitters 3

Prince of Persia - The Sands of Time