whats the best addition u have bought for system

USblues,

If you have a broadband internet connection, pick up a Roku Soundbridge for internet radio. You'll be rolling in better than FM sounding Jazz and anything else your interested in from around the world. Use an Audioquest G Snake stereo mini to dual phono IC to upgrade the sound considerably from the stock wire.

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Usblues .....I have a SqueezeBox. Similar to the unit Mapman above just mentioned, the Squeezebox operates via wired or wireless broadband connection. I get jazz stations from all over the USA and the rest of the world. I listen to great jazz stations in Denver, Los Angeles, Switzerland, Germany and Japan in superb sound quality.

I own the highly regarded Sansui TU-X1 tuner and I rarely play it any more because of the SqueezeBox. The Sansui can get only local stations....the SqueezeBox gives me access to jazz all over the world.
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FM tuners on high end stereo systems are obsolete now I believe as a result of high fidelity digital music devices like the Roku and Squuezebox. I'd keep a good portable or tabletop FM radio around though.

But beware, you can spend hours just surfing from channel to channel with these abulous devices rather than listening to the music (or talk, news, sports programing, nostalgia radio broadcasts or whatever from around the world).

Other things possible with Roku and I believe also Squeezebox beyond excellent sounding Internet radio and thousands of stations to choose from:

1) rip CDs in loss less format to a WiFI networked computer anywhere in your house and play these via wireless connection on your stereo system in another room.

2) run digital output from the Roku or Squeezebox to a outboard DAC or direct to digital input on some newer amps for even better sound.