#1
is there a limit to which cabs you can use on a certain head? do they have to be matching wattage (head + cab)

i.e. i'm getting a Peavey 6505 v soon, but its fairly pricey and the so is the cab (£630) - i cant afford to get the cab right away so i was gonna play it through my friends ashdown fallen angel 60w cab - but my amp is 120w. would it blow the cab??
THE GODS MADE HEAVY METAL
#2
If you play at loud volumes.

The general rule is, buy a cab that's the same wattage as the head or more than, not less.

And, the head and cab's impedences have to match.
"Breathe, breathe in the air
Don't be afraid to care"

Fender Strat/Tokai LS80>few pedals>Orange Rocker 30