I'm about to buy a new amp and cabinet. The amp will be a SWR SM-500. The cab a SWR Goliath III (4x10). I want to get the full potential of the amp, so I'm thinking in the 4 ohm version. But if i choose the 8 ohm version, later i can add another 8 ohm cab and i can choose: Goliath Jr. (2x10) Son of Bertha (1x15) Big Ben (1x18) or i can choose another Goliath III to complement the first Goliath. Example: If i choose the Son of Bertha i will have 3 configurations from where i can choose from: Goliath alone; Son of Bertha alone; or Goliath and Son of Bertha together. But maybe the Goliath alone will give me the sound that i want. I love the swr sound. I loved all the amps i've tried from swr and i owned a Basic Black combo. I don't have to tweak the eq much to get my sound on an swr. The sound i like to get is that Marcus Miller sound but not so bright (i have a '78 Jazz Bass with rosewood fingerboard). I play many different styles of music: Pop, Funk, R/&B, Disco, Salsa, Brazilian Samba and Bossa Nova, Jazz; but what i like the most is Funk and R&/B. What do you think? The SM-500 will deliver 400 watt@8 ohm and 500 watt@4 ohm. This 100 watt difference is a big difference? I play with a lot of bands from different styles (loud drums; no drums, just percussion; drums and percussion...) and i want to depend only on my amp for my stage sound. Will 400 swr watts be enough? Or maybe i will never buy another cab and the best choice will be having right now the full 500 watt with a 4 ohm cab? (if i choose this cab i can always buy another 4 ohm cab and run the both in stereo.The SM-500 can handle 2 ohm configuration on each side in stereo operation) Thank for all your answers. Happy Christmas, Pedro.