I also suggest getting a curly and a straight unit. I have worn lots of lace wigs in the past and I don't ever straighten my curlies because you can ruin the curl pattern after a while and for the types of curlies you are getting it will be very hard to get it to look completely straight plus it time consuming. You can always do a twist set on a straight to make it wavy. I currently have 1 curly (kinda tight like the ones in your pictures), one loose curl, and one straight just in case.