There's rice vinegar, sushi seasoned rice vinegar, rice wine, then we've got our seasoned rice wine that really isn't seasoned rice wine.
Mirin isn't sake, it's sweeter and lower alcohol content. Cooking sake is similar to drinking sake in alcohol content but it's high salt content to be sold as a seasoning/condiment rather than its beverage counterpart. Aji mrin has very little sake content, it has a lot of sugar, some salt and some vinegar, it's the commercial bottled stuff in most mom's kitchen (the 'fake' mirin). Hon mirin is the real stuff if you need for 'cuisine' it's a true brewed naturally sweeter alcohol from fermented rice.
Su is rice vinegar. Sushisu is rice vinegar sweetened with sugar and salted. No alcohol content unless you're drinkin' separately. Get your shochu on. Yee-haw.
http://www.kikkoman.com/foodforum/thejapanesetable/28.shtml