You can NEVER go wrong with any kind of Marshall head or cab for that matter. They have my absolute favorite tone of all time, especially if we're talking THAT kind of budget (assuming my maths don't fail me in algebra). The distortion channels feel and sound great, and just with fiddling with the settings you can make it sound like an whole other amp too! Also, since you were worried about the clean channel of the Peavey I can guarantee you that Marshall amps not only tend to have the most relaxing clean channels, you can also make it sound like one of the most haunting clean channels ever. Ofcourse I'd suggest trying out all possible heads at first before deciding on anything, just saying that buying any kind of Marshall head is always a good buy, and combining it with a Randall cab is a sure way to kick ass!