@rjcrowder:
I know this will likely draw out the Intel lovers - but I've used several boards with both Broadcom and modern Realtek NIC's - never had a problem with any of them…
Well in this case, only one Realtek is PCI-Express, which I think is a big deal. Realtek already is one of the more common NICs with the least hardware in them, with Broadcom having a decent amount of support and Intel being at least silver or gold standard; having said that, even with a saturated link, this is still only effectively serving one person, so Realtek may be more than adequate for my needs –- it really comes down to what your needs are more than anything else.
Also, the Broadcom Dual NIC PCI-E cards are SIIG, so I don't doubt their quality (especially compared to integrated Realtek).