Quick question about BFG Radial T/A's

I'm not looking to go that big right now. Right now it has 195/70R14 all the way around with stock wheels. I want to leave the front alone and focus on the back end right now.

Which is why I wanna get 215/70R14 size tires in the back. Or, do you guys think I should stick with 205/70R14 all the way around so I can swap 'em when needed?