Hi David:
Many years ago my best oscillator was a Stanford Research SC10. I think they have better specs than the HP and they have a large number of options. I think all the options come from the same hardware by changing jumpers or resistors, so you can see how they trade phase noise for aging rate (if I remember correctly by changing the drive to the crystal).
http://www.thinksrs.com/products/SC10.htm
Have Fun,
Brooke
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