On the cab front, what about the Barefaced Big One for price and performance?
And on the amp front I'm thinking about a lighter amp myself and am facing the same dilema as you.
I'm fancying the GB Shuttle 6.0 at this moment in time but I keep looking at 2 rack unit size amp heads i.e. GK RB700/1001, Thunderfunk, Aguilar AG500-SC, Ampeg SVT-3, etc. There's just so much choice out there.
I have been recommended the GK amp heads from a few different people I must say.
Good luck and let us know what you go for in the end.
JTB.