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