lens - What Canon lenses do you suggest for wedding photography on a tight budget?

I am new to photography. I have Canon 1000d (with 18 -55 mm lens). My basic interest is wedding photography.

I am planning to get a prime and a telephoto lens. So, my dilemma is:

1. 
   

   Should I go for 50mm f/1.8 or 50 mm f/1.4 or 85mm f/1.8

   
   
   


2. 
   

   For a telephoto zoom... should I consider 55-250mm IS??

   
   

kindly suggest.

ps: Please note that I am mainly interested in shooting weddings....