Denon 2900 Mods

I just bought a mint, used Denon 2900 with the idea of modifying it. Turns out, it is quite respectable, with the CD playback comparing favorably with my Arcam CD73. In any case, modding the unit will run about $1000 give or take. I would greatly appreciate it if someone with a modded unit could tell me the difference between the stock and the modded ones. I am currently using Spendor S5e speakers and a Music Hall Mambo integrated and I prefer a smooth sound, but not at the expense of detail. As an alternative, for about $1800, I could be into an Arcam DVD player, which is reputed to have excellent CD/DVD-A performance as well as first-rate video. Help is appreciated.