Weapons each 10 levels with as high ee as possible like oddy said. If I was you I would invest in heavy armours which you will be able to use till monk with dex/strenght (at low levels adds like life per kill, lately life steal).
Same for charm ( strenght/dex boost or both if you feel like investing a bit more). For armours I´d suggest you buying them for different levels (1 for low and then 1 -2 for higher (best one at level 45-55) so you have higher defense

+ better stats)
Dont forget life regeneration gear - helps at higher levels, worth investing

Edit: Anyone near level 0-25 up for catacombs?
This post was edited by Vitan on Dec 1 2008 08:33am