I haven't heard the Signals DVD-A yet, but I like A Farewell To Kings in 5.1 a lot. I find myself cranking that one pretty often.
If you like Rush you can't go wrong in getting any of the Dvda's put out so far.
Some don't like some of the Rush like Signals as it isn't majorly discreet,its got some subtle stuff going on in rears.
I had a Dts burn of Signals did not like it very much but eventualy bought the Sector box and the Dvda layer was a huge improvement to just having Dts only, I enjoy it alot now.
My fav's are FTK,2112,Moving Pictures,Signals and then FBN in that order.
The Dvda's are not perfect but they are best sounding versions I have of the same albums and i had the Lp and cd's before this.
peter