Best Tires for 03 Silverado

It's time to replace my stock tires on an 2003 Silverado (265 75r16).  What are some good choices for me?  I want the best.  Mostly city driving and towing a 4500 pound boat.  I occaisionally head back to the farm but most driving is done on the pavement.  I do want something with good traction in the winter for when I head out skiing in the mountains.  I do want an all season tire though.
 
I was looking at reviews on tire rack and the Pirelli Scorpion ATR caught my eye.  I phoned a local dealer and he laughed at me saying the load rating was too high for my truck.  Am I dreaming or is he a dick?
 
I can get some Michelin Cross terrain SUV's from the costco.
 
Anyone have a favorite?

Michelin LTX M/S
 
My all around favorite.

I HAVE 2 SILVERADO TRUCKS.  I AM RUNNING GOODYEAR WRANGLER SILENT ARMOR TIRES ON BOTH. THEY SEEM TO LAST FOREVER AND THE TRACTION IS UNBELIEVABLE! ONE IS A DAILY DRIVER (2006 CREW CAB 4WD) AND MY OTHER IS MY PLOW TRUCK (1989 SHORTBOX STEPSIDE) I HAVE NEVER BEEN STUCK AND THEY ARE THE BEST THAT I HAVE EVER HAD.

I just put 285 70 r17 toyo open country on my 05 z-71 and have been very happy with them.

I am running bfg all terrain ko's and I hate them. I like the pro-comp line.