Mav's Helm is like 2 sojs.
Vex is like 4-5 sojs?
Ist is 8-10 sojs.
UNid Tals Orb is gems at best.
+1 skill charms are now like 2-4 (depending on what they are) for 1 soj. Of course, that is for the charms like passive skills, offense auras, etc. with no extra mods on them.
Unid Wiz Spike- I doubt if you can get an soj, prob gems then.
+3 skills javs I'd guess like 1 soj if that? Not sure, I hvae 2 though!