  We present several sharp inequalities for the SL(n) invariant
$\Omega_{2,n}(K)$ introduced in our earlier work on centro-affine invariants
for smooth convex bodies containing the origin. A connection arose with the
Paouris-Werner invariant $\Omega_K$ defined for convex bodies $K$ whose
centroid is at the origin. We offer two alternative definitions for $\Omega_K$
when $K \in C^2_+$. The technique employed prompts us to conjecture that any
SL(n) invariant of convex bodies with continuous and positive centro-affine
curvature function can be obtained as a limit of normalized $p$-affine surface
areas of the convex body.
