I like old Martins
I own 7 old Martins and play them all on a regular basis. They are all between 80's and 45 years old. I love them all.
If I had the budget for a modern Martin I would certainly give the smaller outfits a look. Bourgeois, Collings, Santa Cruz, Froggy Bottom, H&D, etc. before I opted for their current offerings.
You might even comission a guitar from some of the fantastic luthiers throughout this country. We are living in a golden era of lutherie. Especially in Canada. We have more than our fair share of world class luthiers turning out fantastic heirloom grade guitars. In 50 years people will be bidding up the prices on Laskins, Manzers, Threets, Thompsons, Heidens, Proulxs, etc etc.