What MoBo do you have ? The CPUs don't use same socket to if MoBo is existing, must match socket.
If ya have no MoBo, 3770k is a dead end..... road to obsoletesville .... can not upgrade or replace MoBo or CPU down the road w/o replacing both. Just rebuilt two 1156 systems few weeks ago. One blow MoBo, other damaged by by users attempt at new Hyper 212 install. Couldn't reuse CPU as can't buy an 1156 socket MoBo anywhere .... ohhh..... also face possibility of Windows activation if ya change MoBo manufacturs.
Look for combo discounts....
$28 off
http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.1392841
As for the differences.... SB OCs better than IB which OCs better than HW ..... However as each new generation has better stock performance, by time all is said and done, not a lotta difference
And the differences are bigger than many would like ya to believe
http://www.anandtech.com/bench/product/551?vs=836