I went through this last year - I have a 2001 4.4 Sport. I went with these tires from Tire Rack. I wanted something that would handle some snow and rain and these have done well.

I would think twice about summer only tires unless you garaged the car for the whole winter or switched out to winter tires.

2 of 255/50R-19 Kumho Ecsta STX KL12
2 of 285/45R-19 Kumho Ecsta STX KL12
Total Including Shipping: $889

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles