Apart from the gob-iron, that's what we do. If space is very limited, one of the guitarists goes through the PA too. Our set-up is two Alto TS308s as FOH and two Alto TS408s as floor wedges, and an XR18 for mixing. With a brace of Gravity stands, it comes in at under £1.5k brand new (with TS408s instead of the TS308s), if you got a second-hand XR12 it would be a couple of hundred quid cheaper. We've never had any complaints about the sound quality.