Does it have to be a 14-16? There are older models available pretty cheaply too, often with good upgrades already done, e.g. Exhausts etc.
I picked up my R3T 08 a couple of years ago with Jardines pipes, power commander, and a bunch of extra bits for under $10k, and had only 16k miles.
I have the long haul seat, with the quick detach back rest. My wife is happy on it for 2-3 hours at a time. Longer with stops. Not seen an F6B, but it's pretty comfy and wide.