Indian necks is about all I use. I bought a few genetic hen necks and they were too "genetic" for my taste. Lol I could float a dry fly with those things. Paid a fortune and rarely use them.
Stick with a neck vs a saddle. Only reason being you will have a better range of sizes with a neck. You can buy a saddle but most feathers will be pretty large...mores suited for 12's and bigger in my opinion