Pretty silly.
The 5S is much better value for money - much more power, much nicer design, better camera and Touch ID for a rather small difference in price.
Who with a iPhone 5s actually used the finger print scanner? I used it for about a week just like Siri and it didn't work 70% of the time and never bothered with either again.
The iPhone 5c is a great phone. I would buy it used you can get one for $200-300 on craigslist/ebay depending on your area. I say it would be stupid to get on contract even for free or for 30 bucks like I see them a lot. The extra 15 - 25 you'd have to pay to have them for 2 years (360 or 600 depending on your plan over the life of your contract). If your signing a new contract I'd wait for the new phone to come out.
My fiancé has a 5c and I have a 5s and don't really see much of a difference. My camera is slightly better and I have the finger print scanner. Games are slightly better then on her phone but you don't need a 64 bit processor to play angry birds or flappy bird.