I've got a BlueNext BN909GR. It's a SirfStar III, works well, only disadvantage is that the on/off button is a press switch (i.e. not a proper sliding one) which means it can get switched on by accident.

I've got one of the Nokia ones too, but haven't tested it so no comment.

I've also got an older BT GPS, which my parents are borrowing atm, so I'll come back and update this post when I phone them and find out what make/model it was.