I've paid decent money for Titelist cavity backs, Vokey wedges, and Scotty Cameron putter. They shaved a couple of strokes off my game, it's almost worth keeping score now at least half the time!
cavity backs help tremendously but i would also go get fitted for clubs. i never thought changing clubs other than the putter would help my game but got fitted for a set and dropped handicap by 6. granted a going from a 18 to a 12 is not going to get me my tour card but not having to look for the ball as much is a plus