I know zero about the digital stuff other than it doesn't weigh a ton.
Another option is a pre amp pedal. For someone who lives in classic rock but, but still occasionally wants to play metal AND have it sound good, doesn't want to invest in another amp that will mostly just sit there and is afraid of computers, it's a great option. Downside is you still need your amp, you plug it into the FX return, and if you want to play somewhere else, you have to move your amp.
This is the one I have. They go for about $200 used.
Somebody else here, I don't remember who has a different brand pre amp pedal and is very happy with his.