Not big into sencha but recommend fukamushi, but Ippodo probably has a good selection if you just like sencha and want to look through and try some stuff.

If you like jasmine flavor this is one of my absolute favorite teas https://yunnansourcing.com/products/imperial-grade-jasmine-pearls-green-tea-1

This Imperial Grade Jasmine Pearls tea is incredible.

The tea flavor and the jasmine flavor harmonize into an amazing, cohesive flavor profile on the palate. The aroma is absolutely bonkers, smells like actual magic. I don't have the right vocabulary for this part, but it also has a creamy, glowy mouthfeel.