As far solo guitarists go, Dominic Frasca is interesting.
Ho do makes all the worries go away.
You should definately check MozART Group. They also did a show with Bobby McFerrin. Their offical site.
You said the magic word.
The Temptations: Glasshouse, Power, The Prophet.
Isaac Hayes: Funky Junky, Shaft theme.
James Brown: Too Funky In Here, Funky Drummer.
I'm not sure, if those two would qualify as funk though.