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Focusrite (Green) Voice box MK II before IAS Fireface 800?

Hi,
I apologize in advance if this is not the right place to post this.

I just picked up an IAS Fireface 800 firewire interface and am wondering if using the older (lower-end?) Focusrite Voice Box MKII for vocal channel strip/preamp (before the Fireface) would be a good idea.
This is for a home studio.

M-Audio 1814 or RME Fireface 800

I have an M-Audio 1814 but do have the opportunity to upgrade to an RME Fireface 800. Any thoughts on this? In the past I've had PCI cards from M-Audio and RME and liked the RME's (DIGI96/8 PST) analog outputs much better, though it looks like the 1814 has improved from older products. I'm really interested in the quality of the converters on the RME.