A lot of lifters like using a closer grip (not too far from shoulder width) if their shoulder flexibility allows it.
A closer grip is very common among powerlifters in the IPF; it helps keep the upper body more upright. See examples in this video:
http://www.youtube.com/watch?v=EXj052Ht5pg
A lot of guys don't have the shoulder flexibility for this though, especially if they have any shoulder issues.
Limb length is also a factor; for someone as tall as yourself, a wider grip is more often used (near the collars, and sometimes on the collars).
Wrist wraps might help too; I always wear them when I squat.