So my patience isn't as solid as I had hoped it would be. I went ahead and ordered the 123. It came today, and within an hour and a half, it was installed and the car was running again.
There are several resources regarding installation, so I won't babble on about it, suffice it to say that it was easy, and the video and write up supplied by @AK260 was indeed a big help. Many thanks to all who have replied and helped here on this subject.
That being said, I put a conservative tune on it and drove it around a bit, roughly 15 miles. I didn't want to chance the Beru cap exploding. I have ordered a BREMI cap and should be here Monday.
Until then, the Z is back on the road and my new refrigerator is still in the box.
Priorities.
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