Summary: After quite a bit of research and reading a lot of printer reviews I settled on the Konica Minolta 4750 DN. The product arrived within 7 days of my order (I live in Hawaii - so this was pretty quick as it goes). The installation of the drivers and network configuration was a snap using the disk they provided. Based on one of the reviews here that the duplex printing capability required technical support, the very first thing i tried was to duplex print.
Summary: My sister's long used and abused HP finally gave up the ghost and after some exhaustive research this was the best for her budget. I've not used it much myself, but it installed easy enough, is set up as a shared printer in her home successfully without issue and she's delighted with it. The quality is an improvement on the HP which can be a bit funny with red tones and it's really fast.