Hi newcomer and welcome to the Tom's hardware forum.
The p55 is a very good chipset, but u need 1st bear in mind somethings before select the chipset and the mobo.
1- Exist two i7 models, the 1st one is the i7-9xx series that support Tri-channel, have an amazing performance BUT this don't work with the p55 chipset, this series works with the x58 chipset and the components are more expensive. The 2nd one is the i7-8xx series that have very good performance, good price components and works with the p55 chipset.
2- What processor do ur friend have?
3- Why he need a fullsize mobo?
An i7-930 1366 chipset build gonna cost you $1400 w/ all top end components. This build is expected to perform well with serious OC's (3.8+ GHz+ and future upgrade to twin GFX cards)....Upgrade to Prolimatech Megahalems Heat Sink (extra $30 + fans) if ya wanna do 4.0 Ghz+