i would recommmend you to split the whole amount into 4 peaces. so you can put 2,5k in each coin (2 stable coins, 2 others) i think ethereum and bitcoin is a must have and this should be the two stable ones. than i would pick iota and waves, because the price is very low right now and i see high potential. but this is just my own opinion and i also want to say that i'm still investet in all of them.
What you want to buy just do it but please think and recheck everything to make you pretty sure about your decision. I think you should buy Ethereum and the time is right now because the price of ethereum is going down. Since etherium is good coin, so the price is sure increase after this.