You already have a great amp. What do you hope to gain from switching to the Cary? I would think your money would be better spent on a world-class source (can you say: esoteric, wadia, emm labs?
Joey, I agree with Rich unless you are absolutely sure the Tube Amps are more to your liking than your Plinius. Hopefully you are buying for the sound you are looking for and you have already auditioned them with similar equipment and not just to buy a certain type of amp.
For source, modified players will give you the performance of the top level players for a fraction of the cost. You can get a brand new Modwright for $3k with the "full-monty" of mods to it with warranty. There are many reviews out there on these players since it is usually hard to hear one unless you know someone that owns one. You can always contact Modwright or Vacuum State and ask if there are owners near you who would provide a demonstration.
Here is one of many quotes from people using modified players:
"....and a hyper-modified Sony CD from ten years ago that Ric Schultz of EVS tweaked out and thought, at the time, was one of the best sounding units he ever produced. That Sony cost $225 new, and the mod was $600. The Sony just SMOKED my Esoteric X-01 in a side-by-side, so I dumped the Esoteric (it was a little bright and somewhat thin) about a year ago and have gone with the cheapo Sony since."
I think "smoked" was a little overboard, especially since they then qualified there statement later on. But this person was comparing a player they spent $1k for compared to a player over $10k. Do the math and what else could you use that extra money on in your setup????
Remember these are peoples opinions on these modified players.
Don't get caught up in the "testosterone level syndrome" to state you paid "X" amount of dollars on a player, when you would rather get performance to brag about. Modified players are the way to go IMO, but everyone gets to spend their money the way they like.