What pickup replacement should i use for a gax70?

I have a gax70 and i want to get better pickups for it but I dont know which ones i should get. I play alot of modern stuff (muse) and rock stuff (radiohead) but also like a clean softer sound. My amp is a VOX amp with alot of built in distortions and effects. If you can help me that woukd be great. (im not technical with guitars, I only play them.)