What's my best upgrade options

@OP As others have said, the system is completely unbalanced in terms of the source components versus the rest of it. If you listen to a lot of vinyl, the Rega 3 is the weakest component of all. Without breaking the bank, a Technics SL 1300G and, for example, a Hana ML cartridge would be a big improvement.

Also, have you listed to the system with the surge protector out of circuit? You don't say what make it is, but in general, inexpensive power conditioners are rarely an improvement.

Buy a very good Dac that is a big plus  cd player very limited  power cables too

your cables biggest weakest link ,having owned a Audio store for over a decadec

system synergies ,  for minimal cost Wireworld Eclipse speaker cables 

or platinum if you can afford  try to keep brand the same in interconnects cables 

a Litz cable preferred imo for no Cable Micro arching  worse only connect at the connectors .

It's the economy, stupid.

Err, try it again, it's the sources, stupid.

Not calling the op stupid just the system.

If you are really interested in making improvements to your system, your source components are the place to look as others have stated. I am so surprised no one has mentioned the addition of a subwoofer or two, which is usually the go-to cure-all on this forum. :) I would suggest you start with a new phono cartridge which can easily be transferred to a new turntable should you decide to keep moving forward. Or if you just want to jump right in, get a whole new analog front end. There are many possibilities, and don't forget that a good support shelf is necessary for your turntable.

Thanks everyone. 

I plan to pursue the TT upgrade route.  Not sure what I'll get, doing the research now.  My rub is I have a pair of speakers I'm trying to sell, and I'm thinking about trading to TMR, but I feel their available products is a bit thin.

Streaming isn't really an option, we don't have high speed internet available where I live.  I do have an acrylic S10 and when I tried to set up wifi and qobuz it struggled to buffer.  could be something I can work around.  it may also be my distance to the wifi signal.

I have a huge collection of LPs and CDs.  My father passed about 10 years ago, I have all of his LPs, there's some real gems in there.

I've also thought about doing an overhaul of cables.  And, I do plan to re-tube the ARC when it gets closer to 2K hours (at about 1100 or so now), and I'll probably put different pre amp tubes in the BHK at the same time.  

Thanks again!