what you are getting is fine, just overclock it a little and you will have top performance. for hl2 and doomIII the 9700pro will be fine, i would wait another 1/2 to 1 year to get another video card if the top ones stay at $350~400+
there won't be anymore after the 3200+ after that is the athlon 64 and that has an internal FSB of like 1.5ghz and the ram is Sepperate. or thats what has been hinted at anyways.
If I was you I would just save my momey tell about a week or 2 b4 the launch then go out and buy your hardware you will get it for cheaper and possibly get something better. shoot the athlon 64 (home pc version of the operton) might be out and then u will need the extra money to buy that, if you wanted that even.