If you're prepared to pay "$600+", might as well get a brand new $200 Slim and get $400 worth of games to get a full collection of "legit" games. You can find PS4 games pretty cheap if you know where to look ($5-15 range) and after you get the exclusives and stuff, there aren't that many PS4 games left, the rest are multiplatform, so if you have a decent enough PC you're set (they have controller support, and all you need is a Bluetooth dongle to connect the DualShock 4 to the PC).
"Money isn't the problem." Shaking my head...