I went to mesivta yesodei yeshurun. Both the learning and secular studies were excellent. It might be more yeshivish than you are looking for (many talmidim there so say “geshmak”).
Another school in the area is Chofetz Chaim. I didn’t go there, but I had friends that did. The learning is great, and there is a genuine emphasis on middos. It’s probably less yeshivish in the stereotypical way.