Updated version of this older thread.
The cannith crafting revamp added power and flexibility to crafted weapons, and also made them BTA so you can invest in a single version of "ideal" weapons to store on a mule and pass around as needed.
Over the years I've grown to appreciate item consolidation as a virtue, so the only weapons I consider worth crafting are:
Note that there is no construct weapon recommended. Golems aren't scary, so their DR isn't an issue. The only construct with DR worth breaking is marut, with DR/Lawful. But the default weapon listed already bypasses that, so there's no point to a dedicated construct beater.