Hey guys, so i just upgraded my cabs to Mesa's 4x10 and a 1x18 of the Diesel series. i am now looking to upgrade my head. I currently have a Peavey Firebass, and while it's served me well, it's only 475 watts at a whopping 51 lbs. This thing is really killing my back.
I'm looking to upgrade to either a Genz Benz Shuttle 6.0/9.0 or a Mesa Carbine M6/9.
Now here's my question, should i go for the 600 watt models, or the 900? Obviously, the extra headroom is nice, but the 1x18 rated at only 400 watts. I've read that the big 18s need a lot of juice, but I'm wondering if the extra 50 watts would be too much?
(Just letting you know, I don't know too much in terms of overpowering. I've read the stickies, and I'm still lost.

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