I believe the 4000 Desktop has only one video slot.
The 4000T has two. The C=1084 or eqiv. are really
well suited for toaster work, but you will only be
able to use NTSC or PAL on the system side of things.
I am not sure if the toaster can be connected to
a multisync monitor, if so then you can use all the
AGA modes.
C Snyder