Looking for some climbing power I have recently gotten my father into riding road and he bought a used Cannondale R600 for a great deal to replace his old, too large, steel bike.  The cannondale is in pretty good shape but he's looking to update it for more climbing.  I know almost nothing about updating drivetrains.  It has the original ultegra components and a 9-speed cassette.  Is there a way we could put triple crankset or larger cassette on without completely overhauling it?  Is there another option that would help?  We would prefer a less expensive fix since he is still deciding how much he wants to ride.  Help!