I'm wondering what a good mic preamp for recording drums is. Right now I use a four channel sytek non-tube mpx 4a(burr brown option on channel 3, 4). I want to know if I should look into getting a nice (1-2k ) tube pre, like Sebatron vmp4000. I use :

I own an Allen & Heath Mixwizard (16 channel). I use this exclusively for drums. I would like to upgrade one of the preamps for the kick drum. I would first like to know what will an upgrade do for the sound? And how much do I need to spend for the upgrade to be worthwhile? Please give makes and models with prices. Thanks.