The Agfa paper is worth essentially nothing since it's for a very particular process that is now obsolete.
Some of the Kodak and Forte papers can be quite expensive online, especially at the auction site. Some of the Kodak brands, like Ektalure and Azo, as well as the Forte Polywarmton brand, carry with them a lot of hype and price escalation.
Unless you know that the Polywarmton and the Kodak papers are as good, with contrast similar to new paper, and fog levels that can be worked with, then they are not really worth much to you either, unless you do lith printing.
If you mix your own chemistry, or use the Arista Lith powder developer, lith chemistry can in fact be less expensive than standard developers. If you go this route, both the Forte Polywarmton and Polygrade varieties are capable of outstanding results, as are many of the old Kodak papers, and in this case they might be worth a lot to you.
My recommendation? I like to know what to expect, so I use fresh paper for standard printing, and I always use either Ilford Multigrade IV or (far less often) Multigrade Warmtone (both fiber versions). My negatives are developed to suit those papers, and whenever I get an opportunity to try other papers, I always struggle a little bit, because of the adjustments that are needed. Foma papers, for example, are not as bright as the Ilford ones in their base, so they require a bit more contrast in the negative to liven up. Each paper is somewhat unique.
Jag ar invandrare i Minnesota... Har bott i St Paul sedan 2001. Tackar som frogar. Ar du svensk ockso?