Depends on length... anything over around 8-10m is when you should spend decent money on a cable but up to that point there is very little to tell between a £2 cable and a £50 cable.
I use a HDMI switcher for my kit and all devices are on £6 cables with a £100 10m cable taking that to the TV, looks spot on.
So basically, don't be fooled into sending silly ££ on a cable if it's not that long.