Shadow has a point. It's better to have a set of tires that will do their job over a set of tires that will take a very long time to wear but have very little performance on everyday driving. You don't need high performance, just something in the mid range.
I've had tires that would last 70K before, I was scared to drive my car because they didn't really have much grip. The rubber was way too hard and any maneuvering would cause the car some slippage. Especially on wet roads.
Think of it this way, would you rather pay for tires and have them save your ass when a situation exists or do you prefer to pay your insurance when your tires couldn't help you get out of a tight situation? Not to mention the pain you'll have when your accident free car is now squeaky and rusty? Not to mention it being on the car's record with a lower resale value.
There's a simple science behind tires and unfortunately there's no magic to it. All season tires aren't bad, but there's no such tire that will be the best in both worlds. Being soft during the winter and hard during the summer, having long life in the summer but great traction in the winter. It's like shampoo and conditioner in one, how can you remove dirt/grease and put it back, in one shot? End result is half clean/half dirty hair. Same with tires, there's no magical tire that will work in both worlds especially being long life and super grip. It's one or the other
I'm looking for a set of tires as well and I've come down to only two options, the Bridgestone Dueler H/P 92A and the Yokohama Parada Spec-X. Honestly there's not many decent tires to choose from in the 265/50/20 tire size, I mean yes there's options, but most of those tires are either directional, made in places that I don't trust, have issues like cupping, noisy, lose balance easily, squeal on slow turns, etc. Over the years on the various cars I've owned, I have always trusted tires made in Japan. Directional tires can't be rotated properly so you will either get cupping at some point, or you'll end up changing them early. I had a set of Yokohama's, can't remember the model but they were directional. Great at first, but towards the end, they were cupping. Since then Yokohama has dropped that tire off the market which is why I can't find it today.