Classic:
If you have an external sequencer, and are just using the Motif as a sound module, then you shouldn't get the Fantom.
These are all popular products fighting for the same consumer:
1. Triton
2. Motif
3. Fantom
I would add the EMU workstation in there, but it's just not marketed in the same way.
Basically, if you have one, I don't think you need the other. With sample technology and the ability to import different drum sounds, etc., I really think having more than one of these products is not useful (unless you do like the sounds.)
I view them mutually exclusive. It's a waste of money to purchase another sound module when you can get the samples of the sounds elsewhere.
Obviously, I like the Triton library better, and the two products offer different sound libraries, but I don't think it is cost effective to get both a Motif and Fantom.
Sincerely,
God