A good 4-ch isolated scope doesnt even need to be affordable, we would pay a whole lot for that kind of instrument, if it were to exist. Copy the user interface and frontend from Lecroy (since they do the least crappy ones at the moment), large benchtop form factor is perfectly good as it fits a large display, we dont care for portability.
The R&S RTH did look good on paper but did disappoint me pretty hard, lacking even basic features (and having surprisingly crappy CMRR).