What sort of money are you going to be spending.
I had a Netgear Stora MS2000 Diskless 2 bay Home Network Storage. around £50. click here I couldn't get to grips with it at all. It was tricky to set up then then menus were a tad complicated.
I printed the user manual and it was as thick as a Harry potter book.
Getting my ipod touch to work with it was also a pain.
As I was only looking for network storage rather than streaming, it was a bit over the top for me.
But have a look and visit the forums at Netgear,more info to be found there.