This site allows you to analyze what affixes become available as you progress in level:
http://www.diabloii.nu/affixcalc/
Use the rare column. Affix level is your character level +4 (I think)
Edit: I was wrong it's character level +6
Popular choices include:
Diadems/Tiaras/Circlets/Coronets (which get a bonus)
Ethereal weapons (hoping for auto-repair and decent damage, or failing that something for the merc)
The first four row belt you see (a good choice for item poor players), use a demonhide sash if your strength is low
http://www.diabloii.nu/affixcalc/
Use the rare column. Affix level is your character level +4 (I think)
Edit: I was wrong it's character level +6
Popular choices include:
Diadems/Tiaras/Circlets/Coronets (which get a bonus)
Ethereal weapons (hoping for auto-repair and decent damage, or failing that something for the merc)
The first four row belt you see (a good choice for item poor players), use a demonhide sash if your strength is low