I used to design factory assembly and service work centers.
There are some sturdy benches out there for under $100 and you can add a maple or 1.5 inch HD particle board top if you want.

I am building a new shop for myself right now, and shopping.

Some of the electronics benches are anti-static.
You don't need to get that elaborate, but do avoid Formica type tops and do ground yourself and the bench to avoid sparks when working with gunpowder.

Bench Depot
http://www.benchdepot.com/NWS/index.html

Compmark Industrial Workbenches
http://industrial-workbenches.compmark.com/?trackcode=bizcom

Sturdy but not fancy
www.thematerialhandlingstore.com/industrial-workbench.html

www.SteelSentry.com
Used by US Army armorers

Sears
http://www.sears.com/shc/s/search_10153_12605?keyword=workbench