As others have said the price is all relative when it comes to being a beater - to most people £50 is a maximum price for a beater; to others, an £8k Rolex Submariner is a beater.
I've owned 9 or 10 Casio G-Shocks in my time and have sold every one of them; as popular, varied and tough as they undoubtedly are I just don't get on with them. Maybe it's the sweaty, uncomfortable resin strap, I just don't know but I don't own one any more.
My beater is a Citizen Eco-Drive Skyhawk Radio Controlled. I wear it to work, where I collect and deliver furniture; as nice a watch as it is (£500+ new) I don't care if it gets smacked against a door frame/wardrobe etc. as it was used when I bought it and had a few dings already. It cost me £87 which is a total bargain, it also gets used in the garden, diy etc. It's solar quartz, 200m water resistant, tough and deadly accurate with atomic timekeeping.
I have far prettier and nicer watches in my collection but this is the one I wear when I know it may get bounced around, grubby, scraped, sweaty etc. and I admire that about it. To coin the Timex phrase "It takes a licking and keeps on ticking."