The second best crate to buy. First would be the First strike crate.

However, if you don't want to spend too much, this would be the best. It gives you a decent starting boost with 200k. The chipsets are ok, but they are not perm. The pistol is more of a 'fun gun'. (Imo, the best pistol would be 93se which comes with in the first strike crate). And it comes with a season pass 15 which doubles the GP gain per match which is great if you're playing a lot.

Best Crate for the amount of money you spend.

It gives you the best starting boost.
Ak47 is a high tier gun
One of the best pistol 93se
Both the nades
and 250k to let you buy chipsets and mod for you guns.