Well it's good that the genetic tests are normal... but I know it's frustrating that you still don't have an answer.
I would talk to someone who specializes in fertility issues (specifically male issues) before making a decision. I read this article about a year ago about a couple who had MFI. They did IVF w/ ICSI and TESE. They found 6 "useable" sperm and she got pregnant and had a baby from that.
Just a thought.
The reason I say all of this is that my OB's office told me a lot of things when we first were diagnosed back in January and it turns out that a lot of it wasn't 100% accurate. I got better information from the 2 RE's that I've seen.
Good Luck to you guys!!