ALSO: Regarding Wands/Staves: Are Staves actually more powerful than Wands? I love the new Vis charging option at tables, but you can't put a staff in there.
Staves can store more vis (250+) at the cost of not being able to craft with them. They're worth it if you use wand foci extensively.
In just the Thaumcraft 4.2 install (no Kami or anything else) what is the best/most powerful wand or staff to work towards?
I assume it is the Primal Staff Core w/ energized void metal caps, but then you can't charge it using the table/vis network
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The best staff - for use with foci - would be the primal staff with thaumium caps. You can't craft the void-aspected version because there is no sceptre that can hold the required vis, even with the most powerful discount possible. Use the wand recharging pedestal (with non-energized nodes around it) to recharge it.
Alternatively, you might consider making a staff with a sceptre recipe, by using a staff core instead of a rod. You'll get a staff with 375 storage capacity, but you'll be limited to gold caps because of the vis requirement to craft it. Still, the caps only influence the vis discount, so it might be worth it.
The best crafting tool would be the void aspected silverwood sceptre. It holds as much vis as the thaumium-capped version, but gives you a higher vis discount.