I've had both of those cartridges my self. Moving up to the 20 will be a big improvement by itself. As far as the phono preamp upgrade goes, I would go a different route.
Its less money, but I would get a DV P-75 phono pre instead. Needless to say, its a good match for your new cart.. Use the money you saved and buy a Rega power supply/speed stabilizer. That should make a much bigger difference in SQ.
Its less money, but I would get a DV P-75 phono pre instead. Needless to say, its a good match for your new cart.. Use the money you saved and buy a Rega power supply/speed stabilizer. That should make a much bigger difference in SQ.