If you solely play Runescape and use youtube, and sites of that sort, it really comes down to what you want. An alienware is ideal for gaming, and does run upwards of $1000 of course. A Mac runs of couse around the same price range. However from experience and comparison, I've found that Mac's are generally easier and smoother to run, multiple applications and things alike at once. However doing so can easily be done by an alienware too. Mac's are by far, as I see it more secure, and reliable, and just last longer than a PC. However as a gamer the biggest crutch a Mac has is its graphics card which, to get a comparable one you'd have to be looking at the higher end variations of Mac products. However if you are just going to play Runescpae and surf the internet, there's several cheaper and possibly better alternatives then a alienware, if you chose to go with windows. However, Mac is more purely a choice made for cosmetic purposes. In the end its up top you.