23mm or 25mm tyres?

I've just ordered another pair of Continental 4 Seasons - to get me through the winter. Having punctured twice in three days - on different tyres mind - I thought it was about time I got some new boots.
I was chatting to the Continental guys at the bike show the other week who confirmed that the pros all now prefer 25mm tyres over 23mm or smaller. 
I'm old enough to remember having 18mm tyres the thought of which at 120 PSI just fill me with dread now!

So 25mm are the tyres of choice for 'a better roll' apparently.
These things tend to go around - no pun intended - and I'm sure a few years from now we'll all be told that 24mm is the optimum tyre gauge. For now its 25mm unless you, like me, refuse to conform and it's 23mm! How much difference can 2mm really make?

New boots

I'm really hoping that I'll be able to take my 'summer' bike out this weekend.
This is the first year when I've had a dedicated summer and a winter hack bike at my disposal.
The summer machine is a stock 2010 Specialzed Allez Sport which I've upgraded with 105 groupset and a few other bits and bobs. It's not the pinnacle of cycling hardware but it's my bike; my trusty steed and we've done thousands of miles together.
I rode it last in the dead of winter on the turbo trainer and, as a consequence, there's a 2mm strip worn through in the back tyre. So, here's the question which faces all cyclists: which tyres should I use?
People get obsessive about tyres: 'only use conties me' or 'I use bonties, they're superb'.
For me, and keeping up with the absurd abbreviation requirement, I favour michies. I did have a spell of using vredestein slicks on a mountain bike years ago, which were superb incidentally, but I generally stick to Michelin Pro Race 3 boots.
I've not ridden on all tyres in all conditions but I do find I trust the grip with these guys.
Shop around for them though as you can practically get a 2 for 1 on some of the prices. I just paid £36 for two which is a cracking buy I reckon.
Ride safe.