I'm sorry I didn't welcome you, too. Thank goodness so many good people have my back for days like today - I was up in Billings, looking in via my phone once in awhile but it's so doggone hard to reply on that thing sometimes.
Anyway, welcome! So glad you got the chance to look over the thread - there are some amazing folks on here, wouldn't you agree? You know that once those chicks come, your membership fee into the Broody Brigade is photos of your chicks, right?
@aart is right, get the biggest one. You won't be sorry! I read with interest that you are planning to brood your chicks outside, and I didn't know if you'd read this article or not, but thought I'd toss in the link just in case.
https://www.backyardchickens.com/a/yes-you-certainly-can-brood-chicks-outdoors
I just ordered hatching eggs from MPC, scheduled for delivery in March, so I'll be setting up the pen and getting out the heating pad myself in a couple of months. Ken has promised to cut a hole in the side and one in the back, and I'm going to install @azygous brilliant portal system. So I'll be posting chick pictures again before we know it!