Cardboard - Bronze - Silver - Gold - Platinum - Diamond - Master - GrandMaster - Top 300 - Top 100 - ##

Cardboard: Lowest rank, hard to obtain, funny rank
Bronze: Low rank difficult to obtain
Silver: about average for bad players
Gold: Average Joe a little better then most
Platinum: Starts to show skill
Diamond: Real skill shows and is hard to obtain
Master: Real skill and time
GrandMaster: Insane skill and time
Top 300 and Top 100: Self explanatory
##: Displays the number ranking of the player if they are within the top 15.

All ranks excluding Cardboard and Master and above will have different ranks within them. For example Diamond II and Gold III. These will go from 1 to 5 and leveling through them pretty fast since there is 5.
I - II - III - IV - V

I don't expect ranks to be added but if they are added this would be a nice way to do it.
Also make it so you rank up within normal games so we aren't splitting casual players and competitive players. We are just giving them something to strive towards.