That's a HUGE question. This is a very large investment so you should keep that in mind when choosing a subject. Next is to choose a car that will keep your interest. Kit car sales pare probably 10:1 to people who never finish the project. Be sure to choose something (like a Willys!) that will keep the juices flowing thru the dark days. Finally, what is your skill level? The kit you choose needs to be something you can realistically handle, skill-wise. Kit cars provide a valuable service of giving us parts that are otherwise unavailable but they in no way are easier or cheaper to build than a rod based on original steel.
Answer those questions an we can give an educated opinion.
Answer those questions an we can give an educated opinion.