that system will run MWO on low, you will be lucky to get 30fps with all on low
my mate runs an almost identical dell rig
build the system your self or find a small local IT biz and for the same $ you will get a system many times more powerful
im not sure what the rule is for ATI , but for nvidia avoid anything with the GT prefix, you want a GTX
my GTX 580 smashes the GT630 from the walmart system about 50 times over and my card is so "old" now you cannot buy it, even tho the 630 is from a much newer line than the 580, the GT cards are very cut down budget models and will not have majortiy of the features of a full card of the same caliber (ie a GTX680 will beat a GT730 even tho the rating is higher)
as far as building your own pc goes
its very much recommended, its easy to learn
you can find a friendly local IT group to show you how (small biz types will likely teach you how to build it just out of passion)
or you can jump on youtube , do a quick search for "how to install ram" to see what i mean
there is plenty of tutorials from single parts to entire system guides (as with everything you see online do not take everything ppl say as literal)
i wish i could help you more but iv no idea on what sites are good for prices in the US
if you were in AUS id hook you up with
http://www.pccasegear.com
someone will know a good US parts site im sure
EDIT
was cruising the forums landed in this
you will want to check it out
http://mwomercs.com/...updated-weekly/
Edited by Naduk, 23 July 2014 - 01:35 AM.