Hard to say as each farkle does a certain job, and some add up to be really good as a whole for different sort of rides. An operating McCruise control is something I use all the time. Modified suspension front and back are just something I think is a given. For other rides the heated grips are vital, on other rides the HID headlight and spots are also vital. Communications can be optional, but I like the GPS working, and the CB radio for bike to bike and getting information on road conditions is really useful. Moorehouse seat shows its worth after a few 1000kms plus days in a row.
In other words, I like the lot!