[linux-audio-user] pc suggestions

hello, i have been off the list for a while. i need a rather _urgent_ advice on the buying of a PC for combined Linux / WinXP audio. as a personal Mac user, i'm rather bad concerning the different CPUs, mother boards, firmwares etc. the budget is 3000 EUR, which must cover the whole computer including soundcard (= HDSP 9652 which is 500 EUR here). monitors we have already. the setup suggested to me is intel core 2 duo (which one? also i don't know if there are 64bit problems with windows or linux?), like 2.33 GHz or better, and ubuntu distribution, PCI architecture (to my knowledge RME hasn't released any PCIe versions of its cards), matrox graphicscard. the machine is standing in a separate room, so space / housing / noise is a rather low priority. the graphicscard must be able to feed two TFT monitors analogue (but digital-option would be cool), so the suggestion is matrox millenium p650 (costs 220 EUR approx. however 64 MB RAM doesn't sound extremely fancy nowadays??). it should have a couple of USB2 and a firewire connector. for people reading in germany, if you have any recommendation of companies selling those boxes (preferably "all in one") with linux compatibility in mind, i'm thankfull for receiving hints offlist. is there anything that certainly won't work? thanks, -sciss-