If you buy edo minato you basically lost your 2 years of saving. For such ammount of time invested you cannot settle for "good" offer. You absolutely need to take the best one. If you buy edo minato all you really gain is 30% dmg buff and interrupt on mystery on a ninja, who is not and never will be meta again. Perhaps barrier later on, but if you are ftp you wont get that barrier in 95% of your pvp anyway.

Judging on what is yet to come, sosp naruto will still be strong in a long period of time. Even if you hate him like half of the community, hes undeniably a strong pick and the most ftp friendly overloaded one man army you can ever get. Reconsider if you want to have better results in pvp (and pve, looking how strong that pick was in latest nature training or overall ninja exams) or if you want to have fancy mystery which wont make your game any better. You've been saving for a long time, few weeks more or less wont matter that much. We have pretty good deals every now and then. Last week all servers went crazy on lucky stars with sosp frags and hope for minato jackpot. This week you have guaranteed konan and sosp frags to redeem. Im sure youll get a deal soon where you can buy ninja that will improve your team AND power boost.

Aca1902 has a very good point. You can redeem some frags up to 10k which gives you most power stuff for the ammount of cp invested and save rest for other events. With 20k left konoha great tree isnt bad either, as the tree itself has a very similar item return as fukurokumaru (frags and power items you get are worth around 15k cp when you spend 20k to get enough points to recruit a single full ninja). Think what you want to use, then do some research if this team will be viable in the near future (youtube with Cn videos helps a lot with this). Take your time.