If you're dropping money like that, I'd just go for Kurama Naruto/Madara/Edo Hashi in treasure or something. You'll get 50 frags from lucky * for 25k, so you'd have to spend around 75k just to get him 4 star which is absurd for 1 ninja. Plus when the bond system comes out, if you have Edo Tobirama and a version of Hashirama, you can bond them and Tobirama will cast a passive barrier round 1.

P.S. I'd wait for good events/things you want and then decide to spend your money. It's never a good idea to have the mindset of "I have extra money and I'm looking to spend it." You can do whatever you like with your money, but it's always best to get the most for your money.

I wrote this as it's own comment in case it gets deleted.