I have never had a problem with any stereo in any vehicle I ever bought. Weather it is the Wal-Mart $43.00 Durabrand CD player in the 1964 Ford F-100, The $80.00 JVC CD player (store display model from an eBay seller) in the 1974 Duster, or the others in the rest of my newer & older cars. I mostly run $150.00 Pioneers because they usually look the nicest installed (in my opinion) and have the smooth layout and rotary volume knobs. I have used Panasonic, Clarion, Kenwood, Blaupunkt, Sony, Pioneer, DuraBrand, Alpine, and JVC CD receivers all with great success.
Pyle used to be popular back in the late 80's. All my friends wanted them. $300.00 is a fair deal for all that stuff as long as it is in great condition and functions well.
How old are these items?
There are just like everyone else and have different lines of products. Look around and see what these models sell for on eBay and such. Some of their stuff now is so cheap you can almost buy it new for that price.
Directed Audio & Cadence are not what I consider 'cost effective' systems. Maybe for a true audiophile, but the average person doesn't want to spend $1,500.00 on a CD player, 4-6 speakers, one amp (or two), and a subwoofer with enclosure.