Full Metal Alchemist has much better dialogue and cinematography, but I don't think I enjoy it nearly as much as IGPX. I think it might be because I'm not a big fan of the characters. The story revolves around a teenage boy and his quest to change his younger brother back into a normal human, as he has been turned into a living suit of armor. The little brother apparently was 6 when the series started and is 10 in the DVDs Trusty was watching. I feel like they chose to have a little boy as one of the protagonists, so that they could exhibit innocence and pacifism in a character. I don't think that was necessary and I find myself finding the little boy annoying.
So, mixed feelings about both of those series. However, there is one anime that I enjoy a lot. I watched every episode of Trigun over the course of two weeks about a year and a half ago. That series really impressed me. The protagonist is a pacifist who is wrongfully wanted for blowing up a city with a reward of 60 billion dollars. The dialogue is good, and I think the series has many strong themes running through it. All in all, I've always felt that Trigun overcame many of the shortcomings of anime.
I'm thinking I might drop the 50 dollars for the first half of the Trigun series. It's just that awesome.