The Rega is a good product, but the Classe D/A will improve its overall sound in every sonic parameter. That said, the differences will not be dramatic. The upgrade will be readily apparent, but don't expect, at least in the long-term, a night in day difference. Relatively speaking the Classe D/A is an older design. I would recommend you not pay more than $1,250. Also, the digital cable is critical. It pays big-time to experiment and there is little correlation between price and performance with this type of product.
help with DAC w/current system
I've never used an outboard DAC before, but have a chance at a killer deal on a Classe DAC-1 (Stereophile class A, $4000 retail). I currently have a Rega Planet CD player with a nice Classe amp and B&W speakers. Does anyone know what and how much of an effect a DAC like this would have on a system of this caliber? Any ideas would be appreciated.