Hi,
I have 2 pairs of slant 8s, a pair of Calipers, a pair of Divas. I have listened to the Duetta Sigs and the Mini grands. The slants hold their own against my Divas and are used as my back channels. If you make a jump, I would not recommend either the calipers or the mini grands (woofers are weak IMO). Pay the bucks and go for the True sounds Divas, Scinnies, possibly the Duettas and/ or the studio grands. All except the Scinnies sound fine with good SS or tube amps. I think the slants were the best of the hybrids. IMO If you get a chance, you should audition the varios models at Truesounds and determine first hand,if you want to make the jump and what speaker suits your fancy. Until then, sit back and enjoy the slants. They're darn good speakers!!
Mike