Well Pubul57, like I have said already - it is a close call between the two. Is Isabella better? In short, I like them both. Dodd can (or used to be) be had for $2495 which makes it one of the best values that I know off. Isabella is IMO just a bit better when it comes to sound stage and imaging.
It is also voiced to sound more on the warmer, fluid but still detailed side. The biggest diference is in its buil-in Isabellina DAC which is just awesome. However with DAC option Isabella price jumps to 6K which is quite expensive and puts it in completly different price frame then Dodd.
If I had extra 6K, I would go with RWA and its build-in DAC.
Dodd on the other hand will give you 95% of the Isabella performance and with careful speaker placement, right tubes and some diffusion it will make you stop looking.....at least for a while. I am planing to give RWA another try when my system will be at its 100% so I can ones again evaluate it and look closer into its bass performance which IMO was a bit more polite then Dodd.
Cheers
Mariusz