For the best Jerry tone, you need the middle pickup. You'll find it stated all over this board, (or just check out a few videos where you can see his pickup selector) that he used the middle pickup almost all the time. You could put super 2's in the other 2 spots, but you won't nail it. The neck pickup is still gonna sound too bluesy and warm, and the bridge pickup is still gonna sound too trebly, thin and countryish. (for most songs). Now, if you're playing cumberland blues, thats a different story. That's one example of a time when he used something other than the middle.
Anyway, if I were you, I'd put a super in the middle, coil tap all 3, and if you're fairly happy with the other 2 pickups, save your money and leave them. Those are good pickups. By adding the ability to coil tap them, you're adding more tonal options right there. For the minimal time Jerry used the neck/bridge, I think it can easily be pulled off without super 2's in those spots. In fact, I think a super 2 sounds horrible in the neck position anyway. The one guitar I have that I did that to, got it ripped back out 3 days later and got an sds1in the neck spot. It's the super 2 in the middle that's critical. As far as the buffer goes, it's not imperative, but even without 9 miles of cables, to my ears it adds a very noticeable clarity to your tone. So I'd install that too, in lieu of the other 2 super 2's. If you do this, you'll have a guitar that'll do Jerry well and a whole lot more. I just did this same exact thing to my latest axe.
Keep in mind, your amp and speakers and most of all, your technique also play a huge role in achieving Jerry. JBL E/K speakers are almost as important as the middle pickup in getting the sound. The amp is a little more forgiving, but also important. It all depends on how far you wanna go and how close you want it to sound. I've tried just about everything, and one thing I've concluded for sure is that I'll never sound exactly like Jerry, because I'm not Jerry. Some players come damn close though. I think Vic from Playing Dead is one of the easiest to mistake for Jerry out there.