The documents you mention sound like a lot of proof that you intend to leave. In fact, if you have trouble getting into the States with that, then I probably have no chance of getting into the States for my Sept trip (I will only have return ticket, letter from employer and wedding invitation to show as reason for visit/reason to leave - I have no property etc)
I would actually like to ask a similar question... If you are refused entry on your arrival in the States, what is the proceedure for getting back home? I have already used the search function and can't seem to come up with anything (tried "customs refused entry" and variations of it, plus "home after refusal" - I like to be prepared if the worst should happen).
The only thread that seems to be close to what I am looking for is a Nigerian woman whose thread was closed due to it heating up quite a bit and she doesn't mention the trip back at all.
I honestly think that no matter how desperately I want to see my husband, if it was not for my brother in laws wedding I would not be travelling to the US before the visa process was finished. It's nerve wracking thinking of what may or may not happen at customs on this trip and I don't want to be responsible for putting a grey cloud over my B.I.Ls wedding day if I am refused.
One thing which gives me hope, is that on my last trip to the States (back in Feb) I stated to the customs official that I was entering the States to get married. He asked to see my return ticket and he took that as sufficient evidence that I was intending to leave. I think it may also have worked in my favour that I asked if he could stamp the same page as they had previously, which meant he saw I had travelled to the States on 3 occasions prior to that trip. The stamp won't work in my favour this time, because I have my new passport in my married name... so it's brand new

I might take my cancelled one along with me, just in case.