Hey guys,
I just got an Ibanez BTB405QM TK three days ago and I'm really enjoying playing it. It is my first bass (I play 7-String guitars primarily so I'm no stranger to the low end!

) but although the sounds I'm getting are OK I'm looking for some way of getting the tone that Marco Coti Zelati from Lacuna Coil has on their KarmaCode album. A good example is on the song "What I See". Maybe a better way is to describe it as being similar to Feildy from KoRn's tone. I'm also a big fan of the bass tone from the very start of Strapping Young Lad's "Rainy Season" and Christian Olde Wolbers' distorted tone on the Fear Factory records but maybe something with a little more "grind" to it? All in all I'm looking for those tones but also some versatility would be important.
So what should I get to upgrade from the stock pickups?
Thanks.
(P.S. I know nothing about changing bass pickups or their wiring or anything so go easy!

)