Another what should I buy lens question.

At this time my budget is pretty much zip. Gotta start saving the nickels and dimes. Mostly I do wildlife, and love to shoot BIF,  Thats why I wonder if maybe I shoudn't just save till I can buy some faster glass,

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I want to go to my grave, tires bald, fenders knocked off, out of gas, and yelling, WOW what a ride.