I did a lot of research last night and looks like the most affordable 10Gb switch is the UBNT. I couldn't find a 16 port - 10GbRJ45 under $1300, I can buy the UBNT 16-port SFP+ for $600, twinax cables under $50 and the SM e300-8D comes with 2 SFP+ ports. Also the PCI cards are a lot cheaper on SFP+ format than RJ45.