Not an expert on crafting but here my 2 cents:
"crafts of every level" - you mean all the recipes or crafting for different stages (low/mid/high level twinking)? If it's the latter then you might need chars in the required range and also items with lower ilevel. If it's general crafting then I say craft everything!
...
On a more practical note, it will take a really really great craft to beat uniques/runewords for weapon/shield/belt/armor/helm slot. So it might be a better course to concentrate on:
- Hit power gloves - IAS/knockback/skills + adds (stats/resists....)
- Blood gloves - IAS/CB/skills + adds
- Blood belts - FHR/stats/resists
- Blood amulets - FRW/skills/stats/resists
- Blood helms - mini Guillaume's Face with a built-in LL, look for FHR/resist/AR. If you REALLY lucky you can also get visionary mod and 2soc.
- Caster amulets
- Caster belts - 10% FCR/FHR/stats/resists
- Caster boots - mini Silkweave, look for FRW/resists/high mana regeneration (up to 10%)
- Safety amulets - increased chance of blocking can save dex points for max-block chars
- Safety boots - only source of iPDR on boots, low but every bit helps
- You can also try, to a lesser extent, Blood and Hit-power weapons.
I also strongly recommend looking up some guides on crafting and especially recommended char levels. Even with thousands of jewels you would like to maximize your chances.