Hi, I am Telenator and agree, you do want something as close to original as possible, if that's the sound you're after.
If the EXACT vintage tone isn't that important, the absolute next best thing is a WRHB made with ALL alnico 5 magnets. There are a precious few manufacturers who make an alnico 5 WRHB, and the ones I've heard are clearly more authentic sounding than the rest. Most manufacturers use FeCrCo magnets and while the resulting pickup sounds decent, it ain't no replacement for the original tone. The pickups we've tested using FeCrCo magnets have all exhibited similar qualities like the ability to hold their low end together better when using moderate to heavy gain/overdrive at the expense of less chimey highs when played clean.
I have not heard the Seymour Duncan version of the WRHB but, knowing the outstanding quality of his pickups, and the fact that he uses all alnico magnets, I'm sure that it sounds terrific.
Fortunately, there are several options available now, and yes, we're the most expensive. CuNiFe isn't cheap when it's not being manufactured in a form suitable for guitar pickups. Unfortunately, the people who sold us the little stashes of CuNiFe we've been able to find know this and charged us accordingly. Then we had to have it cut and machined. It's not cheap. If you must have the absolute closest thing to the original, it's available. If something else really close will suit you, that option is available too. These are good times!