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To throw a spanner in your plans, if you're looking to keep it cheap and you need a size L (I'm EU 46) I've just upgraded so have these Flux TT30's spare, they're looking tatty as a few seasons old but they're fully functioning. Mid-flex and playful but very supportive. The front ratchet lever has cracked but it still works fine and doesn't seem to be going anywhere anytime soon.
Be happy to take £30 for them.
Base plate and screws included.


Here's a pic of them working.

Itsjustluke
monkdagola
When I got my first brand new board (2014) I got Union Force bindings, they're still going strong after 6 full winter seasons, never even broke a strap. I did hear that later models weren't quite so durable.
Only bindings I've ever used in anger so can't be much help but they are a mid flex.