Worthy Upgrade ?

I am debating to upgrade to

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor ($279.99)
Motherboard: Asus SABERTOOTH Z97 MARK 1 ATX LGA1150 Motherboard ($209.99)
Total: $489.98
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-06-17 04:49 EDT-0400

From

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($219.99 @ Amazon)
Motherboard: Asus Maximus V Gene Micro ATX LGA1155 Motherboard ($199.99 @ SuperBiiz)
Total: $419.98
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-06-17 04:51 EDT-0400


What do you guys think ? i think could probably sell my old setup for $250ish and my logic is warranty is 3 years and i had this stuff for 2 years so might be good upgrade and warranty refresh. ORR continue saving money and get x99 platform once it comes out ?
 


Performance wise i do realize i would not gain much but from my point of view 3570k is starting to age so my logic is i should probably sell it while it still holds a decent resell value and refresh my warranty on the parts in question so just trying to see other peoples opinions if i am making the right decision oh and my video card is gtx 670 i think there's no need to upgrade it as i checked its resale value is pretty low.