Im going to be getting a Comp-Tac Paddle Holster for my Glock 19 to use for IDPA and was wondering what size belt to buy? 1.5in or 1.75in??? Also should I get the slide version of the Holster which has open bottom and I can use all 9mm Glocks or... Closed bottom which only fits the G19 or G23??? Any help on this would be great.. Thanks