Alienware Aurora R4 couple of Tech questions

Hi all,

looking for a bit of advice really as i want to upgrade my R4 a little more...

1st memory

What's the best Ram i can buy for this system as i tried some Corsair dominator 2400mhz and it wouldn't boot?!

2nd Cooling

thoughts on upgrading the CPU cooler ? maybe H80i ? any better than stock one ?

3rd Graphics card cooling,

Coming from a watercooled setup seeing my 2 GTX Titans hitting 82 degrees is scary, now i have looked at the internals of the case and i gotta say the wiring setup is awful so maybe thats a starting point ? extra internal fans ? where to place i haven't a clue as there is no space for placement ? and finally has anyone here tried watercooling the GFX in the R4 before ? if so please advise lol 

4th Soundcard,

looking for a good external with THX and dolby any recommendations ? 

Now alot of my friends say get shot of my R4 and build a system but i just cant love my Alienware gear and the R4 case! but i feel i am limited to what i can with the system, So hopefully some of you guys can help me out here?

Cheers

Lee