No love here for the 103! LOL! Yet no less an expert than AJ VanDenHul considers it a very good cartridge - and a fine performer even unmodified! So there! Worried about its resonance frequency? Just add about 5 grams (a US nickel) to the headshell to compensate!
Get a Denon 103R. Sounds better than any Grado! I have been using Denon mc cartridges for 40 years (along with some Grado's). Yes there are even better-sounding mc cartridges (for a higher price, of course!) - but the venerable 103 punches so far above its weight that it's an easy recommendation!