Interesting first post for sure.
Just so you your prepared you are going to get more questions than awnsers, and about 1000 different options to consider than a 50cal.
What rifle do you currently shoot?
What range do you currently shoot at?
What range are you hoping to shoot at?
Are you only going to shoot targets?
Whats your price range?
Are you made of money?
Have you considered a .338 Lapua because its basically superior in every practical way?