The reason private rooms are so great is you can easily sneak in ur own booze. Then order sodas along with a few beers to throw the off.
My gang usually does Japas or Sing Sing (st marks or A). Japas is nicer but my measure of Karaoke quality is the # of Weezer songs they have, sing sing has the entire Pinkerton album, done and done.
Popcorn - White Truffle & Parmesan - 6
Cashews - Seasoned & Carmelized - 5
Samosas-Vegetarian/Mango Chutney - 7
Coconut Shrimp - Sweet Chili Dip - 10
Beef Satay - Yuzu Pepper - 11
Edamame - Japanese Sea Salt - 6
Jamon Serrano (Spanish style ham) - 12
Popcorn Shrimp - 8
(Crunchy and tender) - 10
Panko Chicken - Tamarind BBQ - 8
Mini Burgers (3ps. w/ cheese & lettuce) - 10
Crab Cake Burgers (2 pcs. w/blue cheese) - 12
Waffle Fries (Fried potatos) - 6
Buffalo Wings (5ps. spicy chicken wings) - 8
Shumai (Pork) - 6
Cheese (Manchego, goat, or sheep cheese w/ quince jam) each 7/ assorted - 16
Olives and Caper Berries
(Mixed olives and caper berries) - 6
Chorizo - 8
Japas karaoke (there are 3 locations on 38, 27th and somewhere else) have specials where you can get sushi, appetizers and unlimited beer, wine and sake for about 35 dollars pp excluding tax and tip. The food is alright.
You can also go to one of the places in Koreatown like Toto and get a large room and BYOB and BYOF.
re: david sprague
I don't think it's the best quality sushi in the city, we usually just get the rolls. For a karaoke bar, it's alright food. Definitely wouldn't count it as the greatest meal I've had but sadly I've had worse in real restaurants that were more expensive. I ditto Edwin's suggestion about calling ahead and reserving. The only caveat with Japas is that you usually have to say how many people will be coming b/c they need to prep the food and they will charge you for that number of people so if you have a no show, it kinda sucks.
Forgot to add, I've also had good times at Lemongrass Grill's basement karaoke near Union Square including a rollicking good time on Halloween. Apparently Lemongrass closed according to yelp but the downstairs is still open and there's a new restaurant on top which I haven't tried. If you go after a certain hour, their kitchen is closed and you can bring in whatever food you want. However, this is a communal space, not sure if they have private rooms.
One more piece of info - two members of our party are 20. Some of these places seem to be 21 and over at night, so if anyone specifically knows places don't have that, that would be helpful! (honestly though, the 20 year olds may decide they are too cool to sing michael jackson with a bunch of old people)
Keats has karaoke Fri & Sat eves starting at 9 pm. On Fri eve, kitchen is open, Sat eve, kitchen closes at 8pm, but they do allow you to bring food in from outside. It does NOT have a private karaoke room, but the regular crowd, which starts filling the place around 11pm, will liven up your reunion by celebrating with you. Dan, the KJ, will acknowledge your party & encourage the others to whoop it up w/ you. Fun atmosphere.