I agree with Lord_Ac RRK is just for a feel good Japanese fastfood.. Nonki is reaaally good..We go there always.. It isn't that expensive. You can get a tempura bento with Cali Maki for just 200..
For Mikado, the last time I went there, it's really just a Jap Resto for buffet. When you dine in real Jap Restos, some of what Mikado offers aren't as good as authentic.