You are 25, make lots of money, have fun and buy the toy. In your case I would use the emergency fund, but repay it in 2 months or less by sacrificing fun stuff in your budget. If you do have an emergency in those 2 months you can always borrow from the 401k.

Establishing discipline regarding retirement funds will greatly help in your future. Also the fact that you are actually thinking about toy purchases and their negative consequences at 25, bodes well for your financial future.