Hi Malo, personally I\'d go with the ADVC-100. It\'ll connect Firewire and this box will also let you output digital picture straight to a TV.
I\'ve heard some bad reports about the DC30 from other composers. I\'m not sure on the DC30\'s specs, but the ADVC100 will let you do everything. Capture AV/DV and output to AV or DV. I\'m not sure if the DC30 has all of these options.
Also, cause the ADVC100 is an external box, you dont need to install any drivers like you would with the DC30. You also wont have any potential conflicts or crashes that can occur with a internal PCI card.
I have one and havent had any problems at all.
P.S. I think Pro Tools has a preview to firewire option? Not sure about LE. Anyway, you can output a display to firewire that then runs through the ADVC-100 straight to a TV. In fact Hans Zimmer has an ADVC100 and is doing this.