I would go with the first motherboard. Asus is a reliable brand and the board is priced reasonably. The extra features on the Pro model aren't really worth it in my opinion.
Also, what do you think of the ASRock? It has better sound chipset Realtek 898 and the eSATA external connection.
I read a lot of boot issues with P8Z77-M Pro. Is this also true for the regular version (Asus p8zzz-m) or just pro?