Most reliable/serviceable Day date 1803 movement?

[ramilio]

Hi All,

I'm fairly taken with the Day Date 1803 and was wondering if there is a particular movement that I should be seeking out in preference to others? I’m planning on wearing the watch on a daily basis so wanted something that was both reliable and serviceable.

By serviceable, I’ve heard that parts are fairly scarce for some of the older movements, and can therefore be expensive. Ideally, I’d like a movement that could still be serviced by Rolex if need be (I realise they don’t service watches over 20 years only) and had parts readily available.

Any advice would be much appreciated. Any other tips on the 1803 would also be appreciated as I’m a total novice :)

Thanks