Cat and Pro Comp are different.
Alot of PBM and others are just Pro Comp stuff.
Some of the PBM stuff is made by Erson.
$1500.00 is pricey for those.
About $1000.00 to $1200.00 complete depending on springs and set-up is a good price. Those heads can support 800+HP with porting.
On a budget they are not bad yes there are nicer heads but at twice the price.