Yes but if i buy a VPS, i should use this VPS for 1 server only (exemple: Lobby) and if i try to put more task for this VPS... he will be surcharged.
So you may be right but i wait for more comments to chose
How many minecraft instances are you planning to run? How many players are you planning to have at the same time? Are all the servers going to have plugins/mods? Which is your desired server location? EU or NA?
This server is going to be a big vanilla-modded (explained down here) skyblock server. The player start his gam and a world is played for him. I think around ~100 players should be connected at the same time to the server. And finally, the server should be hostedin EU (France)
About the mods/plugins
I should use tons of BIG AND LAGGY plugins to re-create mods in vanilla minecraft. I can't tell you to much (it's a secret) but i can tell you that i should use big made-in-house plugins (exept for the anti-cheat).
Hmm if you don't want to spend much money on your project, then take a look at https://www.online.net (Although it looks like most of their servers are sold out) they have DC's in France as well, idk if they offer ddos protection.