Being UK-based, I would use PriceSpy to filter on all the relevant criteria it supports. For your MP3 player example that narrows it down to 6 devices. That's a

Being UK-based, I would use PriceSpy to filter on all the relevant criteria it supports. For your MP3 player example that narrows it down to 6 devices. That's a small enough number that I can then just skim specs for each, and/or read the manuals.