I have an acer aspire 3004WLMi but a universal charger. This charger is very tempermental but my daughter's charger for an Acer Aspire 5613AWLMi works well.
I would like to buy a new charger but really don't want another universal one or a cheap import. I just don't know where to start to buy a suitable product. Google throws up lots of universal ones and the ones being sold on ebay don't seem to have very good ratings.