You can order one with either the S&S cases or the SE cases built by S&S from any of their dealers. A 124" built by S&S comes with a warranty by them. If you don't want one built by them, then Dragos will offer a 124" and as I understand it he will also offer a bit of a warranty. Not sure that you are going to get a warranty outside of those two but there are other builders that would be happy to put one together for you.
I have two bikes now running 124's. On both bikes I wanted to keep my stock cases. The first bike I had Darkhorse work over the bottom end. The second bike I had S&S work over the bottom end. Aside from the case work, I am the builder of both of them and built the motors with parts from different sources, however all parts are top notch. Neither bike got a crate motor and so neither bike got a warranty. I guess that I am my own warranty.
If you are looking for bragging rights then 150-160 NA is attainable, but you will get there with additional cost. Not just financial cost. What is the bike used for? Bar hopping or touring? You would be sacrificing rideability if you bump compression up and push the power up in the RPM range to attain those numbers. Just my opinion.
My motors are not built by Dragos, but he carries a good reputation on motors. I'm sure that he would be just fine to use. I've dealt with him in the past on cams and exhaust and he was great to deal with for me.
I'd love to ride that 143 but how reliable is it? I'm sure it's thirsty, going over Blue Ridge Parkway you definitely need to bring a gas can. Back to the 124" , I would give Frank (Dragos) a call, real nice guy. You can most likely get a nice package deal with tune, clutch etc.
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