Best cyclocross bike under £1000 and other CX chat

I've come to the conclusion that my Boardman is, despite its protestations, a touring bike with discs and clearance for big tyres+mudguards.

I think it'll stay as it is, with mudguards on, and I will start looking for a more nimble CX bike that, just to annoy AndyP, I will make a concerted effort to ride off-road as often as possible.

So, overall, were/are you happy with it?
I've been offered £600 for the CAAD9 CX9 and am seriously tempted as I do like the idea of discs and the £800.00 price tag, despite upgrading the brakes recently to TRP EuroX's.
I have always had 2 road bikes( one for rain, one for sun) for the past 6 years and only got the CX to play about on local trails and old railways around here (Waterlooville) as well as commuting duties, which it does really well and I adore the 46/36 front chainset as it's so smooth to change ratios, even if I do spin out downhill and occasionally on the flat and can't see me racing at my age and perhaps doing the South Downs Way next year, so the 50/34 isn't too bad as the roadie has that on it anyway.
Like most, my miles have been done on road tyres, just changing over to the X ones for weekend shenanigans.

There's not a great deal of weight difference between the CX9 and Boardman either, but I know I can lose a good kilo by changing the wheels and groupo for starters on the CX9 and can swap wheels with the roadie, keeping a spare set with X tyres on.