There are far more knowledgeable people that can answer your questions. But I plan to do the inter-vlan routing on my ICX6450 and leave the firewall duties on my (virtualized :)) pfsense. It's a beefy L3 switch, might as well take advantage of getting full line speeds.
Coming from someone who found this thread a month ago. I highly suggest you read at least the first post in this thread. I believe both of your questions are answered (at least in part). But there is a lot of great info throughout the thread (search by keyword "DAC" and you'll find several...
You're asking for the ebay listing?
edit: in case yes, it's here: Brocade ICX (ICX6450-24P) 24-Ports Rack-mountable Switch - PoE | eBay
Shipped from California to Ontario Canada. He packed it very well. Unit is very mint condition. no marks on it at all.