Cheers Keith,
There's been a software for the Flex III recently too which is supposed to be great.
Most folk think I'm mad going for a Flex III as I use a Boogie DC5 but it's just too too loud. Also I'm using a huge pedalboard which I'm sick of lugging around and going from even clean to dirty with my settings is a tap dance.
I think the Flex will be the answer and I'm not a tube snob either
But mostly I like it because it has a bank of four switches that allow you to program in the most useful tones and makes for simple switching bam, bam, bam, bam.
It was a couple hundred extra but well worth it I think.