in your first build post you had a 6b memory kit 3x2gb this is for older intel systems. sandy bridge uses 2 channels not 3 so you want multiples of 2 stick of ram IE 4 or 8gb instead of 6.
the p8p67 should be a great board asus stuff is rock solid, just working on a budget like yours sometimes pays to look at the less mainstream manufacturers to get more bang from your buck.
fair enough on the ATI vs nvidia thing but I will say your best bet is to ignore what you are a fan of and just buy whichever gives you the best performance per Â£ especialy when working on a medium budget. Your choice though
looking through these rigs i'm seeing allot of h70's and not allot of air coolers, imo (coming from someone who owns one) the h70 just isnt good enough to warrant the cost. get a decent noctua (or similar) high end air cooler and it will give better deltas and lower noise and be cheaper especially if you are looking at a case like the HAF where case temps are going to be low anyway