its because some of us like to save our hearing...
GL finding a quiet infiniband switch, while you can pick up a mikrotik 10gb SFP+ switch which is dead silent.
Also unless your running massive amounts of IO your probably never going to fully saturate that 10gbe+
First off how many PC's are you looking at connecting?
Why do you need a 10gbe on a Router? That makes absolutely no sense unless you have a direct line to your ISP.
Your never going to get 10gbe on your bandwidth to your ISP, and if you can, you wouldn't worry about cost.
So im assuming you'll be putting it on your NAS which is more logical solution.
So count up how many PC's you want in your network on that 10Gbe.
I would first start off with these:
Find many great new & used options and get the best deals for IBM Mellanox CONNECTX-2 EN Dual Port SFP+ 10GBE PCI-E 2.0 Adapter 81Y1541 Network Adapter at the best online prices at eBay! Free shipping for many products!
www.ebay.com
They work and are supported by FreeNAS which is on FreeBSD, and most other enterprise software as well as consumer software,
Then i would pick up this as your switch:
Amazon.com: MikroTik 5-Port Desktop Switch, 1 Gigabit Ethernet Port, 4 SFP+ 10Gbps Ports (CRS305-1G-4S+IN): Electronics
www.amazon.com
And i would run DAC cables to it and not fiber, unless your talking really long distance.