Having a been a professional singer for 8 years, if that voice goes it goes.. simple as that. plenty of good advice on here from the guys. Just remember its not his fault. its not like he can just change a string and carry on.
they were awesome that night, only one wrong move that night. They did this really slow number at the end that just died on its arse but other than that they were fantastic
If the Marshall has the "sound you've always wanted", then this should be a no brainer regardless of weight etc.
use the money from the mark bass to buy some casters lol