It makes more sense to take the guaranteed 25% tax deduction now and pay whatever tax you have to later. Even if you're in the 25% bracket later, you won't pay 25% effective tax.
When you pull the money from the 401k (Traditional) it will be taxed, but you have 2 exemptions plus the standard deduction (at least) which currently equals about $20K. So you could take $20K before paying any tax. Then you have the 10% bracket which is currently $18,150, and the 15% bracket which is currently $73,800.
So, if you decided you needed $95,000 to live on (which is high, but stick with me here) here's how it would break down under current tax law:
$0-$20K = 0% Tax = $0
$20K-38K = 10% Tax = $1,800
$38K-$94K = 15% Tax = $8,400
$94K-$95K = 25% Tax = $250
So you would pay $10,450 on $95K income, which is an effective rate of 11% even though you're in the 25% bracket.
If you put it in a Roth 401K you will pay 25% tax now and 0% tax later.
If you put it in a Trad 401K you will pay 0% tax now and 11% tax later.
Make sense?