I personally have a Hantek DSO5072P (Amazon) which is quite nice but I have been considering a Hantek 2D42 (Amazon). Coincidentally, a few of us on the Open Retro SCSI discord server were discussing this 2 weeks ago and a few members were fans of the "5012H" oscilloscope (Amazon)I think the fastest retro computer I have runs at 8 Mhz.