Strut Bar
however, with the exception of possibly obstructing part of the engine, making it harder to remove/replace the intake manifold, spark plugs, valve covers, etc., along with a few pounds of added weight, it definitely will not hurt anything.
if you want to get one, just get the one you can get the best price on (don't bother with the 3-point version, the 2-pointer should be fine). if you want to make it easy to remove for servicing the engine, you could get one like Hotchkis sells (see the bottom of This page for pics). the two brackets on each side are seperate from the actual bar, so to access engine components, you only need to remove the two bolts holding it on, and you have an open engine compartment again.
oh, and btw, the correct name for this part is "shock tower brace"

