Hi Emil; You have a well stated list of potential up-grades. I would say that if your room has acoustic problems, no matter what you do with electronics is going to help much. So, you need to assess whether or not your room has problems such as bass "boom", or excess brightness etc. I admit room treatment is not a very exciting thing to do, but when I finally put several ASC tube traps in my listening room they made an important improvement (I had more of a problem with excess brightness than with bass). As the ASC tubes have a full absortion side and a combination bass absorbtion, mid-treble reflection side you can actually "tune your room" to what YOU prefer". ASC is at www.tubetrap.com. But if you're considering a sub, you probably don't have a bass problem. On the other hand, I agree that up-grading your 10 year old Siltech cables could be pretty beneficial. Good Luck. Craig.
Opinions on what my next step should be
My system: Atmasphere S30, Soliloquy 5.3, EVS Mod MSB Dac, EVS Passive Attenuators, Analysis Plus Oval 9 Biwire, Siltech 4/80 ( between amp and dac) and a Sony 608ES CD player as transport. Im looking for the biggest improvement for the money. Choice #1: Get a better transport. Im actually quite pleased with it. problem is it has a captive powercord. Not sure what the future of digital holds. Choice #2: Upgrade the powercords. I presently have one aftermarket cord (Syn Res AC Master) connected to amp. Choice #3: Powerline conditioners. I have none at the moment. I do have 2 dedicated lines- one for amp & the other for digital. Choice #4: try a sub. I cant say that Im unhappy with the bass performance of the Sols but I did hear what a sub can do and was quite impressed. I was surprised at the amount of low frequency information that was on some of my CDs. Choice #5: Experiment with some Argent room lenses and the like as well as Bright Star Audio isolation devices and the like. Thanks to all who respond, Emil