This is a nice read thru on Lynfield and Bloomfield guys. Interesting to me is the price vs performance graph. The question comes to play is the overclockability of the platform but if you're going 24/7 e-mail/rig action, its much cheaper on the P55 platform.
Overclocking wise, it appears the pci controller on the chip is the weak spot. I smell a hardmod to provide more voltage thru the pci-e transistors rather than overvolting the cpu to get it done.
Without further gibbering, heres the link:
Anandtech's Bloomfield vs Lynfield