Jay, I haven't voted because I'm not sure any of them would fit under my power brake booster (I have a real clearance issue there), but the real question is why dick around with valve covers. You wrote the book on intakes, you have more or less made one, why not make a really good intake?
BTW I'm running some Ansen polished 428 short covers that clear, but I had to cut back the baffle mounts to clear the T&D rockers. In general the quality of the Ansen product is unimpressive - lots of crackle on the underside and some large flakes that make me a little nervous.