[Asking for what to buy is even less valid here than asking for new tech - this is both, so let's assume you're asking about the underlying (historic) standards :))]
It's safe to assume that the 'LaserJet' entry stands for use of PCL5. It's a set of escape sequences for printer control introduced by HP. So what you're looking for is any printer that offers PCL5 compatibility. PCL6 might work as well and PCL6 printers are usually PCL5 compatible, but looking specifically for PCL5 will be on the safe side).
The 'Epson' entry probably covers any printer accepting ESC/P commands. A similar, but older (and incompatible) standard introduced by Epson for their printers.
ESC/P has its roots in line printers, while PCL is specifically made for page printers.
As Tomas By points out, selecting the 'Plotter' entry may most likely end up sending HPGL commands. HPGL was introduced by HP in 1977 specifically for their HP-8972 plotter, but quickly became a de facto standard for plotters. HPGL is still supported by many modern devices, usually upper end (ink) plotters.
Essentially, these three languages are the bedrock of printer control before postscript (or GDI) took over. They are all quite relevant for new devices as well - not least to enable replacement, much like you're asking for.
When selecting your new printer, look out for support of either standard. It might be good to check not just advertisements but data sheets and eventually manuals. Not only for supported standard, but also check if a printer can either be hard configured to one of these standards or is able to automatically select it after power up.
P.S.: Great scope BTW - perfect for retro tech.