I go through an occasional love-hate thing with my guts. I love them and they are essential to some things I do. However if I had two basses I'd certainly have one with gut and one without. With only one bass, I do think every now and then about losing the guts at least for everyday working gigs. However I was wondering today if I did that, what I would replace them with? I'd be looking for a string that is: a) Very loud for pizz b) Bowable c) Moderately dark, punchy tone but decent sustain d) Has strong fundamental especially on an extended C string e) The G string is not too thin Right now I have Permanents on the bottom two strings and the unwound Gamut Lyon guts on the top. I've never tried Permanent G and D but I wonder what they are like? When I went to try out my Shen at CSC, they had it strung with Helicore Hybrids. I was totally floored with how good they sounded, especially the G string which not only sounded great, it was so damn easy to get around on compared to a gut G. A long time ago, I used Helicore Hybrid heavy gauge E and A and found them pretty good. I'm not sure how good an extension string would be though. I was very disappointed with the Kolstein Varicor extension for example. A Spirocore extension remains the benchmark for a thunderous low end althought it is definitely bright. I figure a Superflexible extension should be interesting. Dominants on the top two strings paired with something else on the bottom (Permanents or maybe Superflexibles) might also be interesting but I'm not sure I want to touch Dominants with the potential for breakages.