TS, a lot of people here have suggested to go with Haswell... i think naay advantages ang haswell with ur planned ITX setup...
- haswell cpus run cooler which greatly helps since itx build ka
- with stock cooler on haswell maka save ka vs. buying 3rd party cooler
With regards sa motherboard, you can buy something like this:
Asrock H87M-ITX LGA1150
Newegg.com - ASRock H87M-ITX LGA 1150 Intel H87 HDMI SATA 6Gb/s USB 3.0 Mini ITX Intel Motherboard
Many would say nga mas ma future proof nimo ang pc with the new socket pero that really depends on how frequent sad ka mu upgrade ug cpu. If ur the type nga maybe every 2 years or more mu upgrade then Intel will have come out with another socket by then.
For me the biggest advantage sa haswell is that in runs cooler which is what you want for an ITX setup. Nothing wrong with Ivy Bridge man sad hinuon and maybe mas available pa ang Ivy nga cpu and boards karon but nearing 4Q of 2013 haswell will be flooding the market. Its also the "tock" or new architecture sa Intel so that socket with be around for a while.
In the end TS, check lang the price and availability sa haswell vs. ivy for ITX setup then depending on your upgrade pattern, decide if worth it ba siya over the other.