Well Marty, I personally have not tried the Dennon but many like TWL and Arthur Salvatore feel the Dennon 103 is simply the best budget cartridge and rivals many high dollar pickups, only problem is you need a tonearm that has good lateral stability like your Rega. Unipivots are not a good match for it. Just to add a little about the Audio Technica AT09ML. I had 3 of these cartridges and always loved the sound.
below is a link to Arthur Salvatore's site if you have not been here it's a treat. http://www.high-endaudio.com/
Good luck Marty your friend,