That's a really good point. Climate plays a really important role in deciding what breeds to get. Or it -can- since someone in sub-zero temperatures could make a giant-combed Minorca work, someone in the rainiest area could make Silkies work, and someone in the hottest, most miserable place in America could find a way to keep cold-hardy Buckeyes. But it is easier to get a breed that works well in your area so you have to do less accomidating when the weather turns bad.
The easiest way to decide what breed to save would be to narrow down the breed that works best for you. Try to answer any/all of the following questions:
Does egg color matter? If so, what color(s)?
Do you need a breed that is cold hardy or can tolerate high heat?
Do you require a breed that can take care of itself, or will you allow special treatment (ie. breeds that are not disease-resistant, can't tolerate wet weather, etc)?
Do they need to be confined (and can handle confinement without going spastic)?
Do they need to be able to forage for their own food? Some breeds eat all day and starve if they don't still get their full feed. Others can forage for most of what they need.
Do you want a breed that will go broody and hatch out their own chicks?
Is meat important to you? If so, do you demand fast growth (Delawares), a more delicate flavor (real Houdans or Dorkings), or tastes great no matter the age (was it real Crevecoeurs that were rumored to always be tender?).
How much work, time, and money do you want to put into the breed? You can find really nice old Rhode Island Red eggs and start from there. But I can't think of anyone who has really nice Crevecoeurs, so you would be starting from scratch. If you are new
don't pick a breed no one else has. Start with a breed that, while rare, has a lot of people working together so that you can share bloodlines and ask questions. More people will know how to fix a flaw in Buckeyes than in Swedish Flower Hens.
Once you have answered those questions (and anything else that you think might be important to you), go through the breeds and find ones that match up well with what you want. If it's a common breed - don't worry. There are common breeds and rare colors: I have only seen one Rosecomb Black Minorca and I'll be amazed if I ever see another (I finally gave up on acquiring them). Minorcas are "only" on the Watch list, but I can guarantee that Rosecomb Minorcas are Critical. Wyandottes are a very common breed, but it's still hard to find genuinely nice, large Wyandottes with big poofy bodies and large eggs.
No matter what you pick, I would recommend starting off very small and building up from there. Maybe a dozen eggs from two different sources to get started (which could easily be $100 right there. This weekend I spent $200 on three dozen eggs from three breeds - but I'll be getting what I want if they hatch
. If you start off small it's harder to be overwhelmed and if you decide you prefer a different breed over what you have selected you are not out as much money.