Best noodles in DC area:
Taipei Tokyo Cafe in Rockville (Nicholson & 355 behind Anthropologie)
The best noodles I've ever had are the handmade ones at this Chinese/Japanese cafe. I think of them often: super-thick, chewy noodles, steaming hot and very saucy. My favorite: the Sa-Cha. This is an authentic Chinese recipe made with ground shrimp, green onions and Cantonese (I think) spices, and comes heaped on a massive bowl on top of steamed spinach and bean sprouts. You won't want anything else on the menu - if you haven't tried them and you like noodles - get there. Also excellent are the soups with the noodles. As a flailing vltboy, I ask for a special recipe of veggie soup made with lots of veggies and tofu in a water-based broth. These two dishes are great for two - enjoy!
Best sushi in the DC area (possibly in the country)
If you're a carless 'tonian, it'll be tough to make it to this unlikely gem in suburban strip-mall, but if you're lucky enough to find it - and get a table - you'll be very happy. The best personality in the place is Sunny, head sushi chef (ask him where's he's from - Japan?) extraordinaire. Sit at the bar for the real experience and tip Sunny well - he and his team like to treat customers they like with their newest inventions.
There are so many unique rolls on the menu (make sure to check out the specials scrawled on glass near the front) that it's tough to find the real goods. Look past the traditional fare - the little cafe I just reviewed makes this kind of stuff as well as anyone - if you're in Sunny's house, you've got to go big.
Here's the best roll I've ever had (requires minor modification from the menu version - a la Sunny): the Flying Dragon roll with Spicy Tuna (instead of salmon) with crispy tempura flakes, sweet sauce, and green onions on top. This thing is huge, a whole piece of freshly roasted eel comes atop this monster, and the spicy tuna is perfectly made. For wasabi lovers like me, leave it out of the soy-dipping bowl until you're done with this roll or you'll overwhelm the delicate combination of sweet and spicy from the unusual pairing.
Well hounds, thanks for reading - keep looking for great eating spots from me! Coming soon: best falafel in DC, best-kept secret lunch spot in Tysons...