Hi and welcome to OCN!
I personally always advise on not buying these "high end" gaming PCs. Alienware PCs are way overpriced and in your case over performing. You don't need 16GB of ram of i7 for gaming, specs like that are only useful in scenarios like heavy photo editing and video editing over i5 and 8gb of ram.
If you want to go trough building your own PC there has been many suggestions and good discussion in this thread, but in your case a pre-build gaming PC might work good enough.
I still highly
suggest building one yourself! It's a lot of fun and you get what you need for much less money. Or you can go for better gaming system by saving money by building yourself. Also you gain full control over you pc hardware and you can do stuff like overclocking etc on it.
There are plenty of good guides on Youtube for it, Like this series made by guys at Newegg Part 1 Part 2 Part 3
One option would be to ask your local PC hardware store to assemble your pc for you, in my country that usually costs around 50-70€ and they will get it done in a day. You get all the benefits of custom built pc without the hassle of building one yourself!
Originally Posted by Sisaroth
because they can?
i7 does not bring pretty much no benefit at all over i5 in gaming tasks. Some people are just dumb and think that "hey it gets better benchmark results i really should get one". Like few of the people that i've built PCs for have had really hard time understanding this even after i carefully explained it all
Same goes to amount of RAM, most people put 16gb for gaming, when highest demanding games take around 4-6 now days... Also, it is not any more "future proof" By the time 16gb is standard, your old 1600Mhz DDR3 is so slow that you need an update anyway...Edited by EPiiKK - 2/24/13 at 3:27am