Recommendations for locking rear differential?

[86burb]

Hello:
I am new to this forum and it looks like a great information resource.

I have an '86 Suburban, 3/4 ton, 4x4, with 14 bolt 10.5" rear end. It has 3.73 gearing and does not have limited slip. It's use will be 85-90% street and dirt roads here in Vermont, with the balance being mild off road. We also get a fair amount of bad weather up here (like today). I drive it about 7000 miles/year.

I'd like to know the members recommendations for a locking rear diff, or for a limited slip.

Thank you,