This place, BY FAR, has the best ramen in town. Monta doesn't even come close to matching Shuseki. I've tried all of the ramen and udon there and the broth is always perfect (not salty like montas), the noodles are bouncy and perfectly cooked, and it always comes out piping hot! I agree with Charlie L. that their beef udon is amazing. Simple but done so well.
Some of my other favorites there is the Saba (grilled fish), the Agedashi Tofu (fried tofu- it's very light and silky), and any of their tempura items!
This place is a must-go if you're looking for high-quality Japanese food at a good price! Plus their open late!