So what model track bar should I get for my 2001 sport 4X4 to fix the stearing? What brand and part number is the best?

 

I used a Lukes Link to fix my track bar and I have no complaints. My track bar still had the Napa stickers on it when the ball joint went, so instead of spending $200+ (best i could find back then), I tried a Lukes Link. I also used one to replace the tie rod ball joint on the pitman arm as well.
I think the key is that the link replaces that rubber boot with a heavy duty metal casing. It even has grease fittings to keep the inside lubed up. I like them, and for $66, I think they are a great deal for a heavy duty part. Nothing was cheap about them.

 

YEAH I TOO HAVE THE LUKES LINK ON MY TRUCK AND IT WORKS GREAT.....AND LIKE THE OTHER GUYS HAVE SAID YOU CAN REBUILD IT AND ADJUST IT....SO I HAVE NO COMPLAINTS FOR THE PRICE!!!!!!