recently sold my transparent reference for the prana speaker cable (review to come Q4 2007 on dagogo). prana is the top of the mountain in staging, almost equal in bass impact, better leading edge, but potential to sound cool if system isn't properly voiced. my WP6s can sound bright, so it takes a bit of work for me, but very doable.
with tubes, i'd go w/ prana. SS, transparent. either case, you'll be happy.
and transparent + wilson is a no-brainer recommendation. very, very musical, and the end of the road for most casual audiophiles / music lovers.
its just that i think the transparent + wilson combo can be improved upon for those willing to work at it. and what the prana does well, it does better than any cable i've heard (transparent, jorma, nordost, isoclean, TG, JPS).