Yeah I feel ya on holding on to the crossbars. I wish my 3 had come with some OEM, but it didn't haha. Back in December when I was out of school for Christmas break I was actually able to work 40 hrs and save up some cash. That's when I did nearly all of my mods so far, since I had time/money. Anyways, back in December I bought my crossbars. They're the "OEM" knock-offs from ebay, and ran me about $120 IIRC. I've never actually looked closely at an OEM pair, so I'm not sure just how different they are, if they are at all. They've held up to everything that I've thrown at them, so they're fine with me.
I think I'll try to keep the rack as far to the rear as possible, because I don't want any hood glare. I know I'd be angry getting out on the trail at night and having bad glare. Then having to go back through the process of lining the rack back up and centering it. Lazy I know. I'm plenty satisfied with the amount of light I get from my heads and fogs too, so it should work out.
At the same time, once I pick up a brushguard, I'd like to be able to fix up some limb risers for the 3. In that case, the rack would have to sit far enough forward for the cables to run from the rack to the guard. But I'll deal with that when the time comes.
As far as plasti-dip'ing the hood goes, a friend of mine from school did it to the hood on his FJ I believe. He said it started to flake and peel around the edges I think. Not too sure though.