You're putting the cart before the horse there Tommy ....
Second, Japanese swords (and iaito) made in Japan are still measured in shaku, sun, bu. You would be looking for a 2.4.0 nagasa, which is about 28.6 inches. Here is a handy shaku/centimeter/inch convertor ...
http://www.kampaibudokai.org/Script.htm ...
You will not be able to find a Japanese made iaito with two mekugi ...
You'll not find a full samegawa wrap in an iaito unless you have one custom built (mucho moola!) All the iaito being built in Japan will come with panels. That's OK though, since all you'll be cutting is air (we hope!) so it doesn't have to endure the same stress a cutting sword would ...
So, all of that being said, you are going to be pretty well off with most iaito currently being made in Japan. I would advise staying away from the lowest price point iaito as they generally have those being made by the least experienced people in the shop, and I've heard of people having issues with them fairly recently. Stores such as Tozando, Nishijin Sword, Yamato Budogu, Meirin Sangyo, Swordstore.com, Mugendo Budogu, SDK Supplies, and Samurai-store.com all sell quality iaito made in Japan.
There's a lot out there, and a lot to learn. Have fun with it!