[Recommendation request] Cartier Tank Must XL

Hi everyone, for my 40th birthday my wife wants to give me a watch. We went to Cartier in Milan, knowing that I really liked the aesthetics of the Tank Must de Cartier. I tried the small model that convinces me externally but I stopped myself from spending €3600 for a quartz watch. So I tried the XL model that being automatic and with the date was to my liking, but its €5500 excludes it because it is expensive.

I was thinking about whether it would make sense to look at the xl model in the used market.

What do you think?

Alternatives?

https://preview.redd.it/r10uammasvyd1.jpg?width=1242&format=pjpg&auto=webp&s=b2f58d92a9dc48c1281ad7130443a493fd59513d