This is my favourite question and each month someone asks about it. I would always suggest monero and ethereum as priority investment if going for bigger amounts like 40k and more. These two coins would be very great investment for long terms and assurance of stability in them. The next top list would include current ongoing ICO that is social coin which would bestest investment for rich guy like you. Note that they have already made huge fund raiser which means bigger value for their coin. These are top three on mind and you can trust these coins in long term investment.