AES, or not AES...
Some people don't seem to grasp that AES was created by two Belgian cryptographers and after a lot of competitions and open peer-review by most of the world's experts and was ultimately decided to be the best by more or less everyone. That is why it became the official US choice (i.e. NIST), not because it was created with a NSA backdoor of any sort.
Now you might argue that the NSA has built acceleration hardware to assist AES code-breaking, but with the advent of FPGA systems that can be re-programmed to suit any cypher, hence no common cypher is going to fair better. And if you go inventing or adapting your own or some obscure one, most likely you will inadvertently make matters much worse for your own security.
So if cryptographic security really REALLY matters to you, you need to concentrate on having a high entropy key, and securing the key against "APT" style of system wide hacking. Most likely, that is the weak link.
Finally, don't over-estimate your importance to the spooks, most comentards seem to think the NSA, etc, will blow days of billion dollar machine's system time on their scribblings. They won't, not unless you are important enough.
Maybe you are, say a business that is serious money competition to a US gov supplier, for instance. But in reality making your data encrypted in any way means they (and advertisers, private investigators, etc) can't read/mine it so it gets stored away in case they do want to investigate you. Out of 1 billion or so Internet users? Really?