Personally I wouldn't go P67. It's pretty much discontinued now.
If your getting the i5-2400, it's a non-overclockable processor so there's not much reason to pay out for a Z68/Z77. The new B75 is going to be your best option, really nice cheap motherboard but with solid features all the same.
Buying a B75 motherboard might also open up your budget to buy a graphics card another tier higher, 7850 or similar.
Post us a budget or post in the New Build section of these forums and we will see how much performance we can squeeze from your budget
Thanks for the wiki link on the LGA 1155. All of the different types of mobos looked very confusing until I saw the breakdown on the differences.
I posted this up and a someone recommended a i5-3550 on a ASRock H77M with a 7770 or a 7850 depending on how much money I have. I'll post what I'm looking on here as well to get a different perspective since you brought up a B75.
Approximate Purchase Date: 2 weeks
Budget Range: $800(more or less)
System Usage from Most to Least Important: Mostly games like D3, WoW, CS and LoL
Parts Not Required: keyboard, mouse, monitor, speakers, OS
Preferred Website(s) for Parts: Newegg & Amazon
Parts Preferences: by brand or type:
Overclocking: Maybe if it's not too difficult
SLI or Crossfire: No
Monitor Resolution: 1920x1080
Additional Comments: I would like to be able to play the games listed with max settings and I don't mind paying extra for quality parts. Thank you all for your time and I really appreciate your input.