Vintage Road Bike vs New One to Amsterdam

My friends are organising a ride to Amsterdam for a stag weekend (well 5 days) and I've been told they don't want to wait for me on my fixed when they are on road bikes.

I don't want to buy a new road bike and I don't fancy borrowing one to keep up with them so I am thinking about going down the vintage road bike route.

Am I really making a bad decision to look at old bikes? Looking at bikes on here and eBay I'd much rather be on a Colnago with an amazing paint job and a set of Shamals but unfortunately I do have to think practicalities I suppose.

Cheers!

holland is flat as fuck.

stick a bigger gear on, ride hard and force them keep up with you.