I play bass in a death metal band, if that's relevant. My current setup is LTD B-206SM -> Darkglass Alpha/Omega Ultra -> cheapo 500W poweramp -> 800W GK 8x10
I love the sound of my bass, very clear and full/punchy. I mainly use the Darkglass to boost the low mids and top end, getting that clanky, grindy Derek Boyer/Alex Webster sound. I can't boost the low end at all or else the poweramp clips and sounds terrible, also it's a hassle for gigs when the soundguy wants a post-eq DI signal that sounds good out front but not through my cab.
Amps I've been looking at -
Peavey MiniMega:
Pros:
1000W, 700W@8Ohm
Lightweight
Sweepable mids
Cheapest
Relatively transparent tone
Cons:
Reliability, hit or miss
Won't even use half the features
Seems tacky, not rugged enough for gigging
G-K MB800:
Pros:
800W
Lightweight
Onboard limiter
Small
Cons:
Reliability
Knobs seem flimsy
Ashdown RM-800-EVO:
Pros:
800W
Relatively lightweight
Previous brand experience
Love the sound
It's Ashdown
Cons:
Budget line - reliability?
Won't use half the features
No pre-DI
Don't know if baked-in sound mixes well with Darkglass
Ashdown ABM600 EVO IV:
Pros:
Top pick
Great sound
Would love to upgrade to flagship Ashdown model
Extensive EQ
Cons:
Big
Heavy
"Only" 600W
Might not be enough Watts if I down the road decide to go with two separate 8Ohm cabs
First off, be aware that the wattage ratings you are quoting are typically at 4 ohms, not at 8 ohms. running one 8 ohm cab through them will give you a little more than half the power that they will deliver at 4 ohms.
Second, be aware that boosting your bass EQ way up will suck out most of the power from your amp without making a lot of difference in your sound, depending upon what frequency the Bass EQ defines. That quickly leads to clipping in your amp. It takes a LOT of power to produce the lowest frequencies and typically about all they do is muddy up your sound with rumble. Try boosting your low-mids around 250Hz for more definition in the mix and better thump in the chest.
Now to your main question about what amp to get, I'd suggest you take a look at the DNA1350 by DNA. It delivers 1350-watts rms into 4 ohms and at least 675-watts into an 8 ohm load. Hook up either one 4 ohm cab or two 8 ohm cabs to get the full 1350-watts.
This amp has all the bells and whistles including a 4 control compressor with threshold, ratio, attack, decay, as well as hard-knee/soft-knee button, effects loop AND side chain effects loop. It weighs all of 7-lbs. and will run down to 2 ohms if needed, although according to the designer it sounds best in either 4 ohm or 8 ohm configuration.
Here's a link to some info on it:
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It's not cheap. Street price is ~$1269 to $1400. Once in a while you may find a used one, but they are still ~$1,000.