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You obviously take care of calculators, since an Hp28s is one of Hp's more fragile calc's. If you program or use lots of the functions, a 32s will seem cramped. Since you made a 28s last so long, I would recommend another or consider a 48g or 48g+. An Hp32s is more durable and will outlast an Hp28 under normal use, but only has about 1/2 K of RAM vs 32K for a 28s or 48G. (I have heard negative comments about the latest Hp calcs quality, consider New, Old stock).
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When you say you're partial to the 28 do you mean with respect to the other RPL-based calculators like the 48S,SX,G,G+ or GX? If you like the 28S and have never tried the others I think you should. Any one of them is a worthwhile and seamless upgrade from the 28S, particularly the G series. In addition to the built-in improvements over the 28 you will have access to a huge amount of software written over the years for all of these models. The 28S and 32SII are so different I don't know why you would set your choice between these two. The 28S aims for top of the line performance in the most advanced user interface. The 32SII is a capable low-end RPN calculator in the tradition of HP quality but lacks dazzling sophistication except in comparison to most non-HP calculators. IMO the correct upgrade for a 28S would be a 48G+ or GX.
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Check eBay for current going rates on the -28S. Searching "Completed Items", for "*28S calculat*" (without the quotes) should work. I just checked, and it looks like the -28S seems to be going for $60-$70. There are at least three up for bid as I respond.
I actually prefer the -28S to the -48G, but they are more fragile. If you go that way, you'll want to ask about the condition of the battery compartment door, and expect to have trouble with it in any case.
The -32SII has apparently been discontinued, so it will become a bit harder to find. I like it for base conversions at the office and trig calculations at the workbench, but its programming is severely limited.
Good luck!