[Supercoolnothing]

Those lipo's ain't gonna fit bud, you need 2s ones (2 cell 7.4v) not the 4s (4 cell 14.8v) ones you've got there plus if you try hooking them up to that ESC you'll blow it apart instantly.

With regards to the ESC personally I'd be looking for a higher rated one maybe 120a instead of 60a your looking at.

The motor looks fine to me but make sure you get a sensored ESC to go with it.

The servo isn't what I'd choose either it's too slow for use in steering a 1/10th scale buggy you're ideally looking for something thats got a speed of about 0.09-0.07 with a max torque of about 10kg's I'd recommend having a look at the Savox 1257 that's what I use and I love it.