Motu/digidesign Hardware Coexisting? Options

[FreeMidnight]

I have a PT MIXPlus+DSP Farm in a Magma exp. chassis and a G4DP800, 1.5gig ram, MiroDc30+, Atto Dual ULD SCSI.

I mostly use DP with DAE(TDM) for music composition, using the 882 I/O as audio interface.

I'm planning to buy Giga system on PC. So I would use my Mac for sequencing/audio recording and the PC as a sampler. I know I need digital(kind of Adat Link) interfaces on both computers. So on both sides I would probably buy Motu digital to digital interfaces(if they provide what I need) plus a quad port MIDI interface for the PC, unless my 3(...) MTP I/II(AV) +MTP AV USB would be sufficient to connect to the PC world.

So I would need a PCI card on the mac side and another(?) kind of card on the peecee side.

Is it possible , and if yes, witch PCI cards/interfaces/MIDI interface would be the best solution for both platforms?