Gup, Monolith has made my favorite RPG of all time, which was known as Xenogears. It's true that I have not yet played Xenosaga, but from what I gather, it's very much my kind of RPG. I have not heard all of the Xenosaga soundtrack by any means, but I very much liked what I heard of it, and Yasunori Mitsuda has earned my respect long ago for his work on other games, including Chrono Trigger and Chrono Cross. The thing is that I have come to respect Monolith as much as I have Silicon Knights, even though both developers don't have many games on their list yet.
Regardless of age, Monolith has shown me almost exactly what I want to see in a game, and they show a great amount of talent. The same can be said about Silicon Knights.