Just so you are aware, you will run into problems if you can't increase your budget. It's your choice to take the risk, but I can tell you that it isn't a wise one. Think about it this way. How does a host pay for a server worth $100+ when they are only putting several accounts worth $10 - $12 on it? They are overselling, and that isn't a problem if it is done sensibly, but seriously, half of a servers resources for a tenth of it's price is crazy.