I don't reload- woodworking's more my thing. Still, garage space and a very solid workbench are a must. If you build your own, be willing to pay out for good thick SOLID (not ply, not pieced) hardwood. Oak is good.
If you already have the equipment you intend to mount, look at the brackets- if they look like they'll accomodate a table top a couple inches thick, there's probably a reason.
Work benches are like fine women... the good ones show their quality not by how nice they look new, but by how well they carry the pounds they're going to accumulate over the next 40 years.
Edited to say: that goes for the workbench stools, as well....