led strip is a good option as it radiates less heat and u can use it continuously for a long time it is also having longer life spawn .cold cathode kits consume more power as compared to led strip, radiate more heat and u can not use them continuously for many hours ,they may fuse after a continuous use and some time even blast in side the cabby in that case they will burn out your inner components of pc case. i m saying as i was having 7 sets of ccfl kits and i sold 6 of them now having only one ie uv cathode kit to glow the uv material in side the case(some times and for shorter time period).
if u still willing to go for them than best of luck.