Hi again!
Thank you very much FordPrefect about all that links... I´ve been readin´all of them, and now I know some very important points to follow in the proccesor or graphic card choice. And thanks of course for you Anole

I have felt very proud of my English
Firstable tell you that I won´t use the HTPC to record anything ´cause for example, I´ll just try to receive 4:2:2 signals because of the Spanish Soccer feeds...then I will watch them and stop.
I think that the point that it´s really gettin´ me crazy it´s the proccesor choice... Someone told me that I need almost a 2.8Ghz Proccesor to watch HDTV. But I know also that I can run with a lower frequency if I have a really good graphic card.Is that true? If it is, which is the relation between the proccesor frequency and the quality level of the graphic card that I must follow in the final choice?
In addition, I´ve read that, for example, the 64 series of AMD it´s something that it´s just no neccesary for us because 64 bit systems are nice for transfering huge amounts of data, but HD content still doesn't need this (Unless you plan on having 12 HD cards in a system and are running a fiber backplane to a SAN, which is not my situation...)
So then I continued reading the post in htpcnews and they talk about Core Duo technology is the best choice for an htpc. Ok, but i´ve been searching prices and I saw, for example, the AMD 64 x2 3800+ ( 221$) and it works at 2Ghz. Then I see the P.4 541 that works at 3.2Ghz and costs 116 $ !!! ¿What do I choice?
The next step will be the motherboard, but I think that I have no doubts whith it ´cause I´ll choose a cheap microATX Abit, or an Asus, after the big payment that it will take me the proccesor...The graphic card is something that I reserve for the time that I´ll have chosen the proccesor and the motherboard...
Thanks for your help!