Tires BRIDGESTONE or OEM Subaru

I'm a big fan of the Bridgestone Blizzak tires (in your case, WS80).

As a counterpoint to the Michelin PSS, I have Bridgestone S04 Pole Position tires and have been very happy with them. Dry and wet performance has been excellent.

Nope, you don't need to change all four. I had a similar problem on my Subaru Legacy years ago, and I simply bought one new tire and then took it to a local race shop and had them shave the new tire to the same depths of the old one.

They're sort of expensive I think, but the Bridgestone Battlax S20 is really nice in the wet. I had Pirelli Diablo Corsas and moved away from them specifically because of their poor performance in the wet.

Saab with Potenza RE970AS Pole Position tires. Best 3 season tire IMO.

Myself I am on stock breaks with upgraded components. I am running 18x8.5 235/40/18 Bridgestone(RE71R) VMR v810 One thing is when or if you lower the car the 8.5 at ET45 wheel might rub.

Stock bridgstones suck in the snow, the best systems can't help wrong tires for the conditions. 18" X-ice3's, have PP and Jb1 power and the traction systems are very impressive in my opinion. The car limits the power aggressively to maintain traction and control even in very slick conditions (good thing).

I have blizzak WS80 215 55 R16. I love them. Just waiting for some snow here in the Midwest .But they handled very nicely in a downpour earlier this week.

I had Ecopias (EDIT: EL-400s) on my Mazda3. They would not die. At like 90k miles I replaced them because they had gotten hard and the snow traction declined... they still had a decent amount of tread left.

The factory tires on my 335i are Japanese made Bridgestone RE050 Run-flats. They suck, harsh ride, low tire life, loud, and most of all one small pot-hole and you got an instant sidewall bubble.