HMMMM. I guess I will be the voice of discent. Back in the 70's, 80's, and even into the 90's boot science left much to be desired. Especially liners. Thats why foaming boots back in the day was the thing to do. It has always been a gamble. Like L7 said, its a one shot deal. Foam boots come one of two ways, right or wrong. Today, stock boot liners are much better. They take a more anatomic shape and contour the foot much better. They are more consistent. The materials form/mold and hold shape better.
I purchased the Lange 140 two years ago -its the 130 with a foam liner, the foam gives the boot the 140 flex. I took it to one of our local boot fitters with a solid reputation for foaming boots. The liners came out anything but consistent. One of the tubes was kind of clogged so the foam went to the lateral side of the liner and now feels like knuckles being smashed into my feet. I got frostbite for the first time last year. And, they are a constant wrestling match for comfort and circulation.
My point is this. In todays ski industry you should be able to find a boot that works off the shelf. Make sure it starts off a LITTLE tighter than comfortable and work with a professional bootfitter. This way you can get that custom fit you are looking for. I would recomend the Lange 120, 130, or the Nordica Doberman 130's -the Beast series is a waist of time for those looking for ultimate in performance as it is a huge volume shell with a pillow for a liner.
If you must foam your boots, do your research, custom fit your shell before you do the foaming, find out who's the most qualified boot fitter in you area and have them foam it, and most of all be aware that its an expensive gamble. If it turns out well, I won't deny that they ski extremely well. Your perception of lateral sensitivety will reach new hights, and you will feel more connected with your ski. Or, you might get frost bight, unbuckle your boots at the bottom of everyone and in the middle of many, use language reserved for sailors, be out two the three hundred bucks and have to start over again.
I tried it, and won't do it again.
Good luck in whatever you decide.