Looking at the back panel of the 1400 and the 5790, I cant tell any differences. It even has pre-outs unlike the 5590, the 1300 did have them. And looks like the new 5790 also has detachable power cord like the 1400.
There is the new Yamaha HTR 5790, replacement for the HTR 5590 or the RX-V1300. I havent compared it to the new RX-V1400, front faceplate looks more like the 5760. http://www.yamaha.com/yec/products/HTIB/HTR-5790.htm Bestbuy has them on sale on their website for full MSRP. I would...