Chris,
Another drive made for the C-64 was the Indus GT drive (more
well known among Atari 8-bit users). It's cool looking--
all black with a smoked plexiglass cover and two 7 segment LED's
showing what track the drive was using or the most recent error
code.
And another was something like the "Excelerator Pro", which has
a cheap look and feel to it, though it may well be an OK drive.
--Michael Passer
mwp(a)acm.org
There were at least two other manufacturers of
Commodore drives besides
Commodore
itself, but memory fails me at the moment...none of
them were 100% compatible,
and as
such left the market rather early on in the game.