Basically all I use is Forte Polygrade V Fibre. It is great paper. It has a cold tone with a little bit of an olive cast to it, but a quick tone in selenium and it becomes a deep black. Leave it in too long though and you get a horrid rust color, so you really have to watch it in the toner. The polywarmtone is also very nice and I would highly recommend that also.

If you don't mind using graded paper, I have used the Fortezo with nice results, but the polywarmtone is easier to work with.