Thanks Vinnie, and thanks for the welcome.
I am surprised that the question hasn't come up before, especially given the limited options for high sound quality gear at these sorts of prices. Oh well i guess i will have to jump on the bandwagon and the waiting list!
I originally came across the idea of a comp. system to replace my failing CDP at Steves' EA site and after much confusion decided to go for a USB Freeway.... until a day or two later the I2S freeway became an option... which threw me back in a 'too many options' quandary.
The offerings at this site have been invaluable to help give some clarity to the whole issue and I have decided to start piece by piece, so i'll use my existng old PC and start off with a SB3mod.
When Steve unleashes his Wifi converter, or when i can find/afford a I2S input DAC I hope to give one a go and compare for myself.
(can anyone direct me to reviews on the North Star DAC?)
A final thanks to all the regular contributors who have posted their thoughts and comparisons.