I agree the blue rosetted Bengal is pretty, but it's a very personal choice. Though I think the blues are very nice looking I wouldn't want one myself - when it comes to Bengals I much prefer the boldly contrasted colors like brown or silver spotted/rosetted. But that's just me!
It seems like you've been doing a great job seeking out reputable breeders, good on you for doing your research.
I love the fact that all three options do HCM testing to some degree. Also it's great that all three wait to rehome kittens till at least 12 weeks, and that they're all TICA registered (I assume this means all the kittens come with papers too).
I would stay away from the first breeder who doesn't vaccinate prior to the kittens going home, though. That's not something the new owner should have to take care of. The whole point of kitten vaccines is that they are done at the proper ages (about 8-9wks and 11-12wks), so it makes even less sense that they would keep the kittens till 12 weeks but not even vaccinate them.
Also this way if the kittens by chance have a bad reaction to the vaccine, the new owner won't be the one that has to deal with it. Kittens really should stay with the breeder till they've gotten vaccines out of the way.
Now do I remember correctly that you were wanting to get two kittens together? Did you decide if you want two boys, two girls, or a boy and a girl? Personally I would recommend two boys as the ultimate pairing, but I know there are some people that do have two girls or boy/girl with success. Just in my experience nothing beats boy/boy.
Usually they are the most cuddly and affectionate with their human, and with each other as well (especially if they are siblings or have been raised together). If you're wanting to get two, then of course gender is also something you'll have to consider. And whether or not the two kittens you're interested in are siblings or if they've at least grown up together (I know some breeders keep different litters separate and what not).
Personally, I think I'd probably visit the second breeder (San Diego Bengals) first since they are so close to you anyway, just to get a feel for what their kittens are like and to have a look around their cattery - but not make any final decisions yet and just let them know you have one other cattery to visit before you make your decision. Then I would just suck it up and make the trip to Amantra last.
I've heard many great things about them so I'd definitely have to check them out for myself. And if you really like what you see and you click with the kittens they have, then you can just leave with your kitten(s) that day. But if for some reason you aren't happy with Amantra, you can always go back to the other breeder closer to you. I know 2 1/2 hours is a far drive but we had to drive almost 5 hours to get Loki, and it was SO worth it. We had other breeders closer to home too (even some with less expensive kittens) but I really wanted Loki.
It's just a one-time trip for a new family member that you'll have for hopefully the next 15-20 years!