Looking for the best oscilloscope

[john 928]

Hey guys I知 looking for a oscilloscope to do some readings on my 928 but not sure which one to get. I知 looking at a few on eBay that are in working condition with probes
1 hp Agilent 54520a
2 Gould dso 420
3 textronic 222a
I am also a novice with this machine so i would also be looking for the easiest operating system but with all those buttons I would definitely need the manual. Does anyone have experience with any of the ones I知 looking at.
The Agilent 54520a looks like the best deal at 180