I'm not sure if voidstorm come with Jetpacks automatically? Might need to buy them if they want to have the same mobility as the Prince and Void Dreamer. There's a decent chance you won't get Warp Tunnel (I assume that 's the spell you're gunning for) so you can't always secure a turn 1 charge that way.
Even if they do have Jetpacks automatically, I can't help but feel that they're a really expensive, and quite narrow, unit and the Princess and Void Dreamer only add to that exorbitant price tag (440 for 11 T3 wounds)
You could save a few points if 2 or 3 of them had only Brace of Pistols and CCW. Some will inevitably die to overwatch or shooting, and someone has to tank scary challenges against the 2++ snowflake, so you may as well take the wounds and challenge on cheaper models.
As for the Path, I think the Voidstorm would be great with Reaper of the Outer Dark to helptheir charges without costing you anything. It lets them theoretically shoot at one unit and charge another, so you get spoiled for tactical choice. You also get to choose which units get this special rule, so you can leave the Reavers and Jetbikes free from the rage.
If you wanted to keep collector of ancient treasures, then ONLY taking Crescendo for the Antique Path seems like a waste of the path option. There's lots of awesome items - Mask of Secrets as you say, is far better. Don't forget you can Master Craft other character's weapons, which could be nice for the Void Dreamer & Power Maul Baron, for example. Just some food for thought.
I like the Jetbikes though!
They're also just begging for Reaper of the Outer Dark, btw!