File Manager for Atari 8 bit

Hey guys,

now that I have my 1mb Ultimate, Sio2sd and Stereo Pokey on the way for my XE I figure I will shortly be in need of a decent file manager. Can someone please suggest a good, easy to use file manager for the 8 bit series?

Also, a good ASMA (thats the pokey sound format?) player and other good utils such as picture viewers etc?

Thanks.