If you plan on doing the pigtails yourself, be prepared to have to fix baldspots (Katie Bair has a good tutorial if you plan on it: http://pettingzoowigs.com/wigtutorial_parting.html
It'd be nice to know what your comfort level is. Are you prepared to cut the wig to a desired length yourself (or have someone you know do it)? What about styling? Are you planning on using foam balls (etc) under Noriko's pigtails to add that rounded lift? Are you comfortable with cutting your own bangs into a wig?
Well, for Ichigo this one looks like a good option: http://www.amphigory.com/wigs_femme_fatale.html
As for Noriko? I'm stumped. But then again, I'm not good at finding wigs. XD You may want to check Karen's Wigs on ebay. I got my wig from her, and it's a VERY nice toyokalon/kanekalon fibre.
Also, be sure to read through this forum (use the search button! It's your friend!) for information on heat and how it affects wigs. Wigs are plastic - they WILL burn, melt and frizz. Make sure you know what you're doing when styling. Hairspray will usually do the job, but a very, very low heat can be used.
Just make sure you know what you're doing! I'd hate for you to waste money on a good wig only to take a curling iron to it.
You can always buy cheapie halloween wigs and try cutting and styling them until you're comfortable to style your good one, too.