I currently have 2 Alienbee's (B400 & B800) which I have been using with white shoot-thru style umbrella's and they have been working great so far. However, with a studio/white room change I have to position one lite differently and don't like the outcome now. Veins in the umbrella are showing up on the reflections of the object. So I'm ready to invest in a softbox and see that Alienbee's sells many of them. Not sure what size to get? I photograph wheels/rims which are ruffly 21x21x21 (varies) but do have some delima as there's not a whole lot of room in the studio/white room. The following options are avilable: Softbox: 24"x36" 32"x40" 30"x60" Octabox: 35" 47" Also I have no knowledge of a grid. I know what it looks like but not sure what it does or if it would benifit me to have one.