Well as of right now, even with the 64bit OS's there arn't many apps at all that would fully use the whole 64bits as it was ment to be used
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That being said, it would still be hella cool to have a dual opteron setup right now. Only problem is that you might find it a bit of an annoyance to find a Mobo that supports what you want to do. My suggestion is you buy a Single Athlon 64 3400+, Get the Matrox x.100 for capture (freaking amazing capture card), a boatload of ram 2+GB, and some wicked ass SATA 10000RPM Raid array. Just any video card, for now, and wait for the new Nvidia / ATI cards that are comming out this spring. Finally top it all off with an Apple HD 24" display or some other massive LCD. This should take a fair chunk out of ur cash, and give you have a fun toy to "take advantage of Cool New Technology"
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