I've fallen in love with these
Dunlop Ultex plectra. I specifically like the 0.73mm as it offers just enough stiffness for solo and just enough flex for strumming.
But to be honest, I actually wish I could divorce myself from the plectrum altogether. I'd love to be able to play right hand a la Mark Knopfler, Jeff Beck or John Mayer. On the electric guitar I just feel totally lost without a plectrum and on an acoustic I obliterate my nails if I strum without it.