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the more the better. and lag will be generated by the latency of the audio interface you are using instead of too little ram. if you are dead set on a PC id look into the emu 1616. since its a pcmcia interface, it will have the least amount of bandwidth bottleneck. it will give you lower latency than anything in USB or firewire. and its got an onboard DSP with lots of cool VSTs that you can use in ableton too. having the onboard DSP will take the strain off your CPU when using those pulgins and increase your processor overhead = better performance. i just wish it was mac compatable.
i was running ableton on a 1.2 ghz p4 with a 400mhz FSB and ! g pc100 ram and it worked fine. not much processor overhead, but it got the job done. basically the highest numbers you can get in terms or GHZ, FSB, RAM, RAM speed, and HD RPM, the better you will do.
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