Just thought I'd report back now I've had my Kemper for several months, and bought profile packs from a dozen or so different profile-makers.
Firstly, I definitely have found all the tones I was originally after, and more (e.g. never really liked Vox before, but the AC30 is now one of my favs)
However it's not without spending a LOT of time researching/demo-ing etc (Kemper facebook groups are also very useful for advice btw), and a fair bit of money spent on profile packs...
Also spent a lot of time delving into the Kemper's various parameters to tweak the profiles - though I've concluded if a profile doesn't sound right to begin with, there's only so much you can do - however if it does sound good straight away, it can probably be tweaked to perfection with the amp and cab parameters and a bit of eq.
Anyway, here's what's ultimately made it into my favourites folder:
Live Ready Sounds (covers all styles & gain ranges really, can't say enough good things about their profiles)
Top Jimi (like his medium/low gain stuff the best, more vintage tones)
SinMix (metal!)
There a few other profiles from here and there that I use occasionally, but the ones from the above three profile-makers are hands down the most realistic/detailed/dynamic/well-mic'd profiles I've found. All these "feel" great to play as well, alive and responsive/expressive under the fingers.