As far as digital interconnects go, I have used Siltech Golden Ridge (nice, a little soft sounding), K-Works digital interconnect (excellent, but limited production), Purist Proteus (excellent) and Kimber Selekt 2020 (also very good, probably not yet broken in). Since I sold the Purcell I'll probably sell one of the Purist or the Kimber (I have a Marantz DVD player which I use for the 6 DADs I listen to, think I may add all of that to the audio slush fund too!!) in the near future, so take any of my recommendations with that grain of salt in mind!! Jerry O recommends, and a number of folks here in a recent thread are singing the praises of, the latest Marigo Audio Labs digital cable, so check the archives, that seems to be a winner. Also, as I mentioned in that thread, the Kubala Sosna digital cable, currently out in AES-EBU form, was developed using the Audio Logic DAC and I think Messrs. Kubala and Sosna might have picked Jerry's brain a little in developing it, it sounded very good with that DAC and a CEC TL-1 transport in Mr. Kubala's system.
I'd save money on the isolation bases for the transport till you listen to things for a while. The K-Works IsobaseK works wonders under my Forsell, and is a lot cheaper than what you describe.
And I'd think the Digital Lens should degrade the sound, in theory, if the Big Ben would, but if you have one (as your post implies) you can just insert it into the signal chain and let your own ears be the judge!