Systen Upgrade advice


My current system componenets listed below. I am able to make some improvements. If this were your system what would you change out first for the biggest improvement? Thanks.

Audio Research SP8, Aragon 4004 MkII, Linn LP12/Ittok IV/BenzMicro Glider, DIY Hybrid OB Speakers, Velodyne HGS12, Emotiva ERC-3, Burson Conductor DAC, JK Ciunas USB Converter.
DH Labs, G Huffman, MIT 750, and PA Audio cables.
jimbones
Solid state on a Power Amp. I am open to either on a Pre. This is #1 for reliability purposes and #2 I think that since the early 1990's there have been big improvements in solid state so a good SS component today is significantly improved (?). There are lots of tube stuff I salivate over (Manley, VAC, VTL etc)but out of my league. I would consider Pass. In fact I have been considering the X150. I was considering the Plinius but some have said they run even hotter than the Pass stuff and I have concerns with reliability/servicing of an item from overseas. At least I can get Pass equipment serviced.
Oops, didn't answer the important question. Budget is $2000 (a bit more if i have to)
AC power isolation and conditioning will elevate your entire system. You might be quite satisfied. Worth a try.
Well, i am going to install a dedicated line from my fuse panel. I have monster power center, i'll have to check the model number. just bought hospital grade outlets
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