I have a Mark Viii as well. It came with a 410t and sounds awesome. I have another 410t that I can use for bigger venues. They are both 4ohms, so paired the amp will run at 600 watts and 2 ohms. I have been pretty happy with the sound. No reason to change it yet!
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Peavey, Gallien-Krueger, Traynor
& Gibson Thunderbird Club #97
I used my MarkVIII with a Sonic cab loaded with JBL E140's, and an old Kustom, Blue sparkle, 215 cab loaded with, (you guessed it ) JBL E140's. Nice chunky sound for roots type music.