Find someone local that you can subcontract under. Have them teach you the ropes. Good luck.
EcoHouse - Welcome to the jungle - both the property preservation world & preservationtalk.com.
Disclaimer: I'm drinking - read on at your own risk.
In preservationtalk's forums you'll find the single most experienced collection of people in the industry, bar none. And you'll get all kinds of advice from them ranging from tactful suggestions to "run now while you still can
" to even harsher words of warning depending on where the advisor is currently at in the love/hate cycles that are this industry. Take all advice (pro or con) with a grain of salt and you'll ultimately be able to make your own informed decisions.
Here's my $.02 for the companies you listed and every other company out there:
RESEARCH THIS SITE, the information you're seeking is here.
You're going to find contractors that have been burnt by every one of those companies, and others that think they are good companies to work with. You have to decide how much you are willing to gamble with your time & money.
The above advice from JenkinsHB is probably the best advice for someone like you just trying to start out - A lot less gambling involved, and probably better pay too.