Farscape opening theme - can't believe noone mentioned it yet. It's theatrical, symphonic, fastpaced, with enough strangeness (especially in the choir vocals) makes for a fast, easily recognizable and intriguing start of each episode :)
/BDK
Ah, how I envy you - four whole seasons AND the Peacekeeper Wars to top it of ;)
(and yes; do NOT watch even the beginning of PW before you've seen the end of S04!)
/BDK