These 1/700 submarines are all from the DML "Modern Sea Power" Series that came out in the early 1990s. They're out of production now and fairly hard to find. Each kit had one Soviet and one Western sub.
My collection includes the Soviet Typhoon and two versions of an Oscar II; US Lafayette and Ohio class SSBNs; a Soviet Sierra, a US Los Angeles class, and two British Trafalgar class SSNs.
Someday, I'd like to add the others, which were hard to find even when the kits were new: a Soviet Delta SSBN paired with a Japanese Yushio class, and a British SSBN paired with a Victor III.