I understand the wanting for that feature only on mac, but you might want to look at the althlon again
When it comes to protools and mac vs pc....A user in the pc digi001 bbs developed a test to compare hardware configurations vs performance. Basically what happens is you open a track and add 5 specific plugins to it. The you hit record and let it go for 1 minute while watching the cpu load meter. If it doesn't go into the red, then you add another track and start over. Each track has 5 plugins on it, so when you get up to 10 tracks for example, thats 50 plugins. Since the digi 001 allows only 24 tracks, when you get there then you start adding aux channels (pretty much the same thing).. You keep adding tracks until your system goes into red and maxes out...You can then compare your score and configuration to others.
Most people complain "I wouldn't use that many plugins" or "I don't use 3 delay plugins on one track". That is not the point. The digidesign plugins don't take up much cpu power, but the good ones like waves, bombfactory and others DO...They sound awesome...I have an 800 mhz p3 and I can never put as many waves c4s as I'd like to. trust me, this IS an issue.
A pc with a 1 ghz p3 cpu usually gets right around 23-24 tracks..thats 120 plugins running at the same time, while recording, not mixing (you'd get more if you weren't recording)
Most athlons at somewhere around 1.2 Ghz or so (which are cheaper then intel cpus) have been getting somewhere around All 24 tracks and 10-15 Aux tracks. Math geniuses that is 195 plugins at once. The best I've seen was 24 tracks and 18 auxs...
Now some people realized, hey why not send this over to the mac forum and compare pc to mac once and for all.
So we did. There weren't many replys with results...most of them complained..."oh I don't need that many plugins" or "this is not a realistic test" I think most of them did the test and just didn't want to post their results because they were so bad.
Of the systems that did run the test, Most of them topped out at something like 12 tracks total. Many of them got much less.
These are systems that can cost thousands more than athlons. If you need that feature, then you gotta get a mac. But REALISTICALLY, when you're almost done with a mix and you know you just need one or two more c4's on a track and it's giving you a too many plugins error, it's a BIG bummer.
Anyway, going the digi001 route is a great choice regardless. It's a blast to use.