No way... you gotta know what you're aiming for, not what you're willing to pay for it, if you want a great system. The system I'm using right now was a custom make, put together by myself and a friend, and budgeted. While I can say that "experiencing problems" after 6 years of age is remarkable for any system that's meant for high gaming performance, I also can't ignore that these last 2 years I've had to cut heavily corners with gaming performance just to make sure my system could handle it. So... that's more like 4 years of working *adequately*, and 2 years afterward of heavy struggling. And I can trace the cause to my erring more on the side of cost than firsthand knowledge of what I wanted done.
Between this system and the last one I built myself, I'd gone through about 2-3 PCs that were store-builds which I'd rather just file away in the back of my mind, but that last one was a Pentium II I made in 1999. Back then, I knew EXACTLY what I wanted (and tragically, I was literally 2 months earlier than the first Pentium 3 chips) and my system was built for those purposes... and it was a dream. It cost me everything I had at the time, but it was the system I have the strongest and happiest memories with. But getting the PC of my dreams 15 years ago led me to slack off on keeping up with the latest and greatest hardware, and the following store-build systems further handicapped my awareness of the latest improvements in tech, so by the time I went to work researching parts for my current system back in 2008, I had to rely on suggestions and word-of-mouth rather than my own knowledge of what worked. As a result, I was more concerned with saving (in case of having to repair breaks) than foregoing $50 here and there for absolutely superior parts. And thus why I'm left with a system I CANNOT upgrade, because the parts needing swapping out would necessitate a new system entirely.
So, no way. Not gonna just head to a PC place and give them a figure and hope for the best. I wanna know exactly what I'm making by knowing exactly what I'm making it with.