This is quite possibly the most frank and honest thread I've read on this site about becoming poz. I have a gained a lot of respect for many of the posters in this thread for their words of wisdom, regardless of the advice being welcomed or otherwise by the OP. Bearbandit especially, who has suffered at the hands of this disease and it's many experimental treatments, has volunteered his insight and experience for our consideration and does not deserve to be dismissed with a "Who asked you anyway" attitude. It is my belief that the OP has read a few things on the internet which have given him the idea that HIV is no longer a killer and that current treatments effectively neutralise the virus. This unfortunately is not universal. The treatments do not work for everyone. There are also side effects to consider, as Bearbandit has mentioned.
There is a lot of glamorisation on here about becoming HIV+ and/or passing it on, although this usually comes with the disclaimer of being 'fantasy' or 'fiction'. Regrettably, I believe there is more truth than fiction to a lot of the stories on here, which is a little worrying but I certainly don't want to become poz. At the end of the day, your question about life expectancy is irrelevant if you are left with no quality of life due to the complications that may arise from this disease.