Some more...

For Japanese: Shin Daikoku (Sukhumvit Soi 19), Sake no Mise (Soi Thaniya), Min Min (Sukhumvit 33/1, for noodles and Japanese-style Chinese food), Maru (Sukhumvit 55).

For Vietnamese: Le Dalat (Sukhumvit Soi 23; the plain, old "Le Dalat" at the end of Sukhumvit Soi 23 on the left side -- NOT the newer, fancy "Le Dalat Indochine" earlier in the soi on the right).

For Steaks: Neil's Tavern (Soi Ruam Rudee, near the intersection of Wireless Rd).