First, that opening paragraph makes it sound like you're under the impression that the PS4 will be backwards compatible, but it's not. Or were you referring to the streaming of old games via Gaikai thing? If so, I don't think there's any news on which games they'll have available.
But hey, if you liked
Silent Hill, you should try
Resident Evil 4. It's more actiony than
SH, but it's my favorite survival horror game ever, and it's on almost every platform you can think of. Also, you may have noticed that there's a reasonably large
Dark Souls contingent here on JazzFanz, some of us think it might be the best game ever. That one's on PS3, 360, and PC.
Oh, and I made a big list of my favorite games a few years ago (chronological order, oldest to newest). You can check that out:
https://jazzfanz.com/showthread.php?149-Video-Game-Thread&p=180743&viewfull=1#post180743