Ahnko,
The sound comparison was really close and difficult to hear the difference with my recording setup. #1 is definitely bright, clear, and with the best sustain, possibly too bright for a tenor for my liking. Those are fluorocarbons. The #2 are nylons, and less bright but thicker strings for those who don't like the thin Alliance strings. #3, the J71s, are a bit quieter in sound all around, although balanced, seem to lack the responsiveness for acoustic playing. Less sustain than the other 3, but perhaps good for pickup playing. #4, another fluorocarbon set, similar in brightness like #1 but not as bright. Because they are not as bright, they bring out a slightly fuller sound than #1. Hard/high tension strings that are rigid and thicker than #1. I'll leave these on a try them out for awhile, they are Kekani's favorite, and now I see why.
As for the low G strings, Kekani recommended J4804, the hard tension bronze wound "D" string. All other "D" strings for classical guitar would do. The J4704 are normal tension bronze wound and seem to be in stock. The J4304, J4504, J4604, and J4404 are silverplated copper wound in light, normal, hard, and extra hard tensions. You can choose depending on the tension/thickness you desire.
I have used the J4304 light tension silverplated copper wound which is .028 in diameter. I have not compared them to the higher tensions. I used this on tenors and concerts.
Like mentioned in other threads, the silverplated copper wound strings tend to be a bit more boomy for low G but are said to last longer than the bronze wound. You might have to try a few, they are less than $2 each. Make sure you share your experience.
Most players will just pickup a set, what they don't realize is that someone put this set together from singles. The advantage of choosing singles is that you can customize your strings to the sound and playability you desire from YOUR uke, not a generic setup. Also, if you break a string or one of the string wears out quicker, you can just swap it out without having to buy a whole set.