Vintage watch advice

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Hello all!

I'm a new user here and also new to the world of buying vintage watches or even Rolex watches for that matter. I would like to buy a "proper, luxury" watch as a gift for myself for my upcoming wedding.

I've been browsing the forums for a while and watch sites trying to find the right deal. I've fallen in love with the Datejust because of it's timeless aesthetic, universal recognition and entry-level status. Particularly fond of the blue dials.

I came across a posting for a Rolex 15000 Date blue dial for $2600 (plus service) which seems like a good deal to me but I wanted to get the opinion of more seasoned members from here.

I'm unable to post links yet but the details on chrono24 are:

Movement: Automatic Winding
Movement Details: Oyster Perpetual
Case: Stainless Steel case with Smooth bezel (34mm dia.)
Bracelet: Generic Leather Strap. 7 inches.
Dial: Blue Sticks.
Certified Pre Owned. 100% all parts original. Our watches are carefully revised inside and out by our experienced watchmakers.
Model Number: 15000
Date Setting: Quick Set Date.
Crystal: Plastic
Circa: 1981
Movement Caliber: 3035
Jewels: 27
NO PAPERS.

Pic attached.

My other option is to get the beautiful new Master Collection Moonphase from Longines.

Pic attached.

Please let me know your thoughts or opinions.