Santilli, we more or less went over this topic once in the past in The "Splash, What Systems Do You Use..." subject:
http://www.storageforum.net/forum/viewtopic.php?t=2615
Basically, if you get a combo USB2 + Firewire card, you only use one slot. The one I use, a Firewire Direct (brand)
6-Port Combo FireWire & USB v2.0 Combo Professional PCI Host Adapter...
http://www.firewiredirect.com/store/product.php?productid=115&cat=34&page=1
...has both internal and external Firewire and internal and external USB2 ports. The internal Firewire and USB2 ports do not use proprietary ribbon cables, instead, they use common
external Firewire and external USB2 cables to route the internal Firewire and USB2 connections to front panel hubs. You're after front panel USB2 (and Firewire) capability, correct? By the way, all the FireWire Direct cards use TI Firewire chipsets (i.e. -- have a long track record for being "good").
With the Firewire Direct 6-Port Combo FireWire & USB v2.0 Combo Professional PCI Host Adapter, you will also have a full complement of external (backside) Firewire and USB2 connectors. As for the USB2 controller on the mobo, you can simply defeat it if you do not plan to use it.
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As for my front panel Firewire (400 Mb/s) and USB2, it's a Koutech Model 7102 FireWire/1394+USB 2.0 Combo Internal Front Bay Hub. It fits in a 3½ external floppy drive bay, or can be put in a 5¼ external floppy drive bay with an adapter. They are available in black as well.