I don't know enough to recommend individual knives (will leave that to others here), but definitely take a look at JNS or JCK. JCK is very low shipping
I asked him about a custom shape and he said he was cool with it, but I was a bit underwhelmed with my Nashiji nakiri so I never followed up on it.
Welcome to KKF!
Your budget allows some flexibility and allows you to get some knives directly from Japan (check JCK site)
Guys, could you read it? What's written here?
So I've got a few knives coming from JKI (Gesshin Ginga & Uraku) which both come with sayas. They are a gift to my parents