I think it's pretty much standard they will give vga cable. You can use dvi to vga converter i think it's included in the package. For the hdmi port , try and adjust the position of your videocard.

in gaming nope, but if you are running application or programs that uses hyper-threading then yes there will be difference.

grab the one that's the cheapest, don't think there will be much different between the cards.

yes can get already, just top up another rm200. Spend the extra money on getting a better case. You won't regret it when you have a case with good cable management.

DOA sometimes do happen, but Asus is one of the 'premium' company out there and their build quality is very good especially the directcuii cooling which is excellent . My 290 directcuii for example is humongous btw and build like a champ

As long as you have a decent psu (recommended 80+ certified), I don't think you have anything to worry about getting that asus gtx 760

Asrock Z97M Anniversary, I think idealtech is running an offer now at RM309, can ceck on that

Try hunt for 2nd hand gpu, you can find used 770 in the garage sales but they are a bit of a hot commodity so yeah be quick if you want one. Your best bet isdefinitely with the used r9-280x or if you're lucky an r9-290 . I have used both amd and nvidia gpus. So far both brands perform well except in some games like AC3 which sees the nvidia edge ahead a bit due to txaa but that game is very unoptimised. Power consumption wise , in my view nvidia is slighly more efficient but if you're getting a decent 600-700w psu, u dont have to worry about it.