I will say that the Neurochrome build manuals are some of the finest I have read in the industry (I have built a LOT of diy designs!). Pretty much everything is included except the soldering part. If you are a good at soldering, I would give it a try. The easiest amp to try in the Neurochrome arsenal is the LM3886DR if you want to solder something. Next is the Modulus 86. Both are available as blank boards so you have to get all the parts from Mouser/Digikey, etc... After that, the Neurochrome Modulus 186, 286, and 686 are all presoldered but you should've had a few kits under your belt just so that you know how to configure everything properly, i.e. sofstart board, power supply, chassis, etc...The 686 is the most complex in that regard only because of the physical board dimensions (i.e. larger than any of his other kits) and honestly you want to invest in a nice chassis and have good mechanical skills as it is that good of an amplifier.
If you look on diyaudio.com, there are a ton of documented builds of the Neurochrome variety and I am sure Folsom amplifiers too.
Do understand that there are builders like myself who build for the sake of building and not necessarily ultimate sound quality. Kind of like guys who collect/build cars for the experience of learning. It's more of a journey for us. So asking what is the easiest build and what is the best sounding amp for the money are not really the same question!
P.S. The only other diy company I have dealt with that has exceptional build manuals is AMB audio. But there is practically no hand holding there. You purchase the blank boards and procure the parts but the instructions and parts lists are first rate. The designs are top notch sonically. However, if your soldering capabilities are poor then you are kind of on your own in the debugging department (although AMB's forums are helpful). If you need to get your confidence up first then you need some easier builds. I am sure AudioNote has excellent build manuals but you pay out of the nose for those kits.