V8 - Great perspective. I will absorb all of this before making my decision. I am gonna try to wait until March to make my final decision. (Work Bonus).
Its nice to be excited by new gear so you must be chomping at the bit.
Couple of other things I thought about ( as my mate is int he same position as you and thinking of getting one, hence I keep thinking about what you need to know)
1) Your biggest issue is choice - eventually with profiles but initial with how you want to monitor (FRFR etc). for me that's another reason to go powered toaster or rack. I prefer rack because I think the toaster is better suited to studio as the rack is designed to be rack mounted.
2) The Quad cortex - its not even released yet and its probably going to be a great unit but the Kemper is an established product, road tested etc. There is a lot to be said for that
3) When you get it, think about what you need first - so many people set theirs up in different ways, some have 1 amp per song, I tend to use 1 performance ( same as a "bank" on an effects unit) per band. Once you how you wan it to work, setting up is relatively easy and intuitive.
4) Strongest part of the Kemper is the amp sound and feel. Weakest part ( although improved greatly recently) is the computer interface. As I only use this for setting up ( for which it works very well) Its not a problem for me.
5) If you go for the Rack or toaster, don't forget to budget for the remote. Its essential for live and whilst there are other options, for me, its the easiest and most effective solution ( its plug and play as well!).
If for some bizarre reason you can't get on with the Kemper, the second hand market remains strong - as my mate is finding out when trying to buy one. So you risks are really low.
Roll on March