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Samson True Blue is my choice, it's a bit oversized and heavy, non-spliceable, but has a lower stretch than any of the ropes you're considering.
All my bodylines are True Blue.
jomoco
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At 10% load, True Blue stretchs 2.6%. I find that it stretchs more than 1/2" 16 strands and is extremely heavy.
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A 10% load on True Blue is 730 pounds Norm.
That said, about 10 years ago a group of local climbers here decided to do a little low tech testing on various climbing lines available to us at that time.
We took the 5 top brands and cut some 25 foot hanks for testing with my trusty 84 Toyota 4X4 tooltruck. We tied one end of the hanks to a big stump, and the other end to my truck's front bumper, a 3 inch tube. In low four wheel drive I gently backed up until each rope was taught, then dumped the clutch. Each rope of the 5 tested in this manner snapped except for the True Blue which stalled my truck.
Needless to say we all bought 600 foot roles of True Blue.
Pretty low tech testing I know, but seeing is believing!
jomoco