I have listened to two other versions of Bach's WTC, including Glenn Gould's attempts. His version is widely and often, cheaply available - I bought his version because of this - but his version is in fact a very idiosyncratic interpretation.
I was impressed by Gould - the virtuosity, the velocity and robotic snap of his playing, but the music sounds like a victim of vicious discipline - it will leave you impressed, but maybe also cold. If you want to discover the Well Tempered Clavier, don't buy Gould's impression first like I did. It is an unsuitable introduction to this work, and apart from leaving me cold, it left me feeling slightly confused and disappointed. Leave it till you know the work, and you will appreciate the eccentricity of his interpretation more after you listen to a more accessible one.
Listen to Rosalyn Tureck's recording instead, and not only will you be impressed, but also touched. Her playing is calm, rich and sonorous. She nurtures the melody and it responds by swooping and soaring. As a result the music has a narrative that can be caught by the ear and interpreted by the heart.
The two are both very different approaches but they both sound very personal. For me though, the Tureck wins because it is so instantly touching and human.