I dont want to sound like a elitist d-bag (i am sure i will come off as one tho) but the psx and playstation are 2 different things. The psx is the name of a ps2/dvr that only came out in japan, released in 2003 and was rather large and expensive. You may already know this though as some people call the ps1 a psx for some reason.
Anyways back on topic. You should see if you have a retro video game store in your city. Find the prices on ebay and amazon and check to see what is average and see what you can get from a local store. If you dont have one your city your best bet is ebay. Considering you have all the cases and manuals you are going to get quite a bit. I collect nes and snes games and anything with a manual and a box doubles the price lol.
My two regrets i have is i owned a gamecube with 40 games and sold them to get an xbox 360. Now i see the games going from 70-150 dollars. I also had a gameboy color with about 20 games plus accessories and they go for quite a bit too. Being young with no job and no money i had to trade everyhing in lol. Now i am buying everything back for double what it was
