Find the weak link to help me spend $800 or so

Nice set up. I can't help myself either - priority for upgrades:

-Power supply for new room - 10 guage romex with dedicated breaker and decent outlet(s)

-acoustics of room, room treatments on wall surfaces, windows and corners

-a really secure foundation for your turntable, stone, thick wood platform, etc.

-replace power cables on your amp (sorry)

-upgrade IC between pre and amp (sorry)

-replace power cable on pre (sorry)

-replace power cable on Rega (sorry)

-upgrade IC between Rega and pre (sorry)

-upgrade your speaker cables (sorry)

Stop and take breath. Each successive upgrade in current delivery, acoustics and isolation will be more noticable than the last because the benefits are cumulative and limiting performance inherent in your quite good exisrting gear.

TUBE PHONO PREAMP!

Hey thanks for all the replies!

Room conditioning is of course a great idea, except that I am likely to be in that room for only a year and a half or so. Plus I kind of favor low budget room conditioning. I don't regard room conditioning as a tweak -- the room is a hugely important component. But I don't want to invest big $ in it 'cause its temporary. Similar remarks go for upgrading the electrical sockets, etc.

I have thought of dac for the Planet. The question for me is whether vinyl is so superior to digital that a dac won't make sufficient difference to get me listening to more CDs what with all the vinyl I have. Of course, a tube buffer or tube tube preamp with or without phono (I could run the C-200's phono stage through the tape out into the line stage of a tube pre) might be a nice change/improvement for all sources.

The headphone sections in the Accuphase pre and power amps are already quite good, plus I have a Meier Corda MkII that I like pretty well.

I already have other cartridges to swap out -- an excellent good older Grado and a Sonus blue gold, and a plain vanilla DL103.

Slowhead -- all the gear is up top spec, I am sure. There I have spent money.

An antenna is a great idea, Onhwy61. That can be moved, and I do love my local community radio station (WMNF Tampa). I'll see how the reception is in the new place.

Well, I still need to think about it. But keeps those suggestions coming, folks!

Rnm4: I was refering to your pre/power. That pre has a historic following, a fine piece from that era. Sounds like you have that covered.
Other thoughts: Swap the Grace for a used Graham 2.2. Consider another SUT, something that can be modified to really dial in to your specs.
If your using a stock platter mat, Herbie's makes a fairly priced one that improved playback on my idler.
After trying many atennas, I use a small outdoor bipole. Not much more than a two car antennas on a stick, but quite effective and inexpensive.

I agree with you that your system is "pretty damn nice". I do not see a power conditioner listed. If that is not an oversight, that is the first thing I would consider. I believe it would improve the performance of almost every other component. Even if you decide to get something else right now, it is something you should get eventually.