So...I have a problem (ashdown cab ordered)

So its official I have a problem with buying gear, but this time its an Ashdown ABM-410. Got a reasonable deal on it so can't be too bad, right? Anyway any other players using one? When it arrives it'll be paired with my humble mag combo until I can buy a head. I'm more than likely to add another cab to it as time goes on, but...

What head should it be paired with?

How many watts should I look at?

I'm tempted by the rackmount ABM 500 as it will fit in my rack perfectly and has 575 watts of output and I really like the ashdown sound now I have found it. Would this be a perfect match?

Many thanks

 

Around about £1000 and I need to do EVERYTHING with it. From big fat and warm to slapping to whatever else takes my fancy.

It needs to be loud and punchy with a fair amount of presence (as in being felt as well as heard) enough to get over a cranked JCM 800 with an animal of a drummer. Plus the valve bit which can be set up for a gritty drive is a major selling point for me.

I've heard one of these heads in the flesh and I am really impressed with the tone and how loud it is, so its a contender. Are there any other I should look at?