I didn't read the linked article to find out what you are trying to accomplish but regardless I can make a recommendation.
Buy a used server pull (preferably from not-China, but even that's really not important) i340-t4 off of eBay http://www.ebay.com/itm/IBM-49Y4242-I340-T4-4-Port-Gigabit-PCI-E-Server-Network-Adapter-Card-/361940630659?hash=item544557bc83:g:VSQAAOSwc-tY3XdW Something along those lines.
Just use those NIC's and disregard the Realteks.
The Realteks will probably work perfectly fine for 5-600Mbps throughput, might not work at all, might give you a bunch of headaches? That's why they aren't recommended, they are just a mixed bag which is not what you want for NICs on a networking device.
So, since you are already planning on buying another NIC, just get a good one and use it.