The truth is with all the SPECS of that Acer, its merely a marketing tool for those looking for something cheap and "Powerful", the Problem, it seems powerful, but it also runs on Vista which uses a lot of RAM.
wth? That's so dumb. Vista isn't the reason why pre-builts suck, i use vista on my self built computer and its perfectly fine. Pre-builts are usually bad because they rely on a flashy video card, cpu and ram (or so they say, you'll normally get a scam with a low end 8 series card.) to trick people into getting a dodgey psu/motherboard (not to mention they are overpriced). Vista has nothing to do with it, infact it would be a bonus on 90% of systems (minus real low end 1gig of ram p4 $499! deals)
Also the build we recommended is $1000, what he asked for. If he wanted to spend less then we could recommend him a good $750 deal, but its what the OP asked. Also from what i understand you told the OP to get a pre-built and put a 9600gt (SPARKLE!!!!) in it, short answer no, long answer nooooooooooooooooooooo.