is the old motherboard a socket 478? or a socket 423?
edit: never mind... i found what i needed. It's 478.
I have noticed something though... according to the specs at the e-machines site, your old board supported PC133 SD RAM... so you are going to need new ram as well. Everything else should work fine though.
For a board... out of limited choices my suggestion would be the
ECS 661GX-M
my suggestion on ram would be
Corsair ValueSelect 512MB (2 x 256)