I would just have the 4.5 mod done to your scd-1. I have a scd-1 with the same vsei upgrade that yours has. I plan on sending mine in for the 4.5 upgrade. The 9000 is pretty flimsy compared to the scd-1. No way would I give up my scd-1 for a 9000. I have spoke to Allan Wright, Warren Gregorie, and Bill Thalmann about this and they all say that the 4.5 upgrade will provide a major improvement in sound. The 4.5 mod is about $450 to $500 as opposed to MAJOR bucks for a dac6.