If you want to invest $60k now then you have to decide your priorities first. Is it safety or higher profits? For how long are you planning to hold? This would result in different choices. If you want safety and long-term (half a year +) investment then bitcoin is definitely the best. I guess it's safe to suppose it will reach 2x current price in months. If you prefer risks and are ready to wait for a long time then I would strongly recommend iota and electroneum. Both have high potential but are not ready to expose it yet. For short-term risky option I would choose ripple, for it is too much down for now and can easily recover since it's centralized. As for safe short-term investment - well, I'm afraid I don't even know if such a thing exists. Good luck!