Not worth the upgrade then if you are already running SB or IB
I really wanted to upgrade but it's not worth the money or hassle to go from my 2500K to Haswell.
My last upgrade was from a Q6600 to my 2500K, and that was a huge! I'm not expecting my next upgrade to be as big as that was, but there is not enough real world difference to go from my 2500K to Haswell.
Haswell would be a good upgrade from an old AMD setup or an Intel 775 or 1366 setup though.
NZXT Switch 810 - i5 2500K - Gigabyte Z68 UD3H - 8GB 1600mhz Mushkin Blackline - Zotac 970 GE - Crucial MX100 256GB SSD - Samsung F3 1TB HDD - Corsair H100 - Corsair HX850 - Asus VE247H
PC Audio: Asus Xonar STX - Sennheiser HD650.
Portable Audio: FiiO X3II - Audiofly AF140 - Etymotic ER4s - Fidue A83.