A trustworthy coin needs a regular trustworthy team behind it so it wouldn't be a fixed rate but rather a continuous expenditure that will be paid per month to team members. Just for starting, I suppose 10 to 15BTC might be the actual starting expense in which it depends on duration of it as well, then it goes up from there. Skilled developers don't come cheap.
10-15 btc is not enough since dev can spend more money for developments and payed big for those who create his coin or build a team and i can't imagine how it will cost him since im not expert nor have knowledge for coin making, but to sealed up this question OP should seek for adviser or shall we say find a better team who can create coin and develop it for him so he can make his dream coin turn to reality, and im sure to make good coin takes many months to develop it seriously.