Currently I have an Ampeg B2-R (350 watts @ 4 ohms) with a Yorkville 4x10 (8 ohm, 500 watts) and a yorkville 1x15 (8 ohm, 300 watts). I'm sort of confused as to how I should go about upgrading my rig to get a little more power. What do you guys suggest? I'm open to brand name/model suggestions, but mainly I need to figure out which part of my rig I should upgrade. My cabinets seem kinda powerful already, were it not for the 8 ohms of resistance on both. Anyway, thanks in advance for any help!