I got around to installing my 4870 card last night. man what a cramped fit,I was warned that even though it would fit my HP Pavilion case,that it would be a close fit,having to manage space with the power cables. Just made it,whew. I'm running stock fans and for now I just leave the side panel on the case own when running games,temperature idles at around 60C total,and around 70 for when running games. Eventually I'll look into some collants to help manage the temperature abit better. I haven't seriously on it yet though,well outside of playing that turdy game called X-Blades,lordy was a stinker. I knew I was buying a bad game when it was on clearance at Target two weeks ago,haha. But anyways it runs so smoothly with many effects on high,again this card is amazing. Other than that I've been gaming by trying out demos and have been getting used to Catalyst auto managing my fans and temperature till I have more time to read up on controlling the settings to my liking.
But this card,oh my god. I'm seeing a dramatic jump in performance,but then again I've been gaming on an integrated Radeon 200 for the last 3 years,gaming with the 4870 is amazing now. Games run so smooth with many effects on very high settings,again amazing card.
I wanna say thanks to you all who helped educating me on what/what not to do when upgrading the PC. Your input here has been an experience and I'm a better gamer for it. I've learned how to not be afraid to buy and install hardware now. No more being at the mercy of Best Buy with their pricing and installation fees. Its weird but there is something really satisfying about the fact that I took the upgrading into my own hands and came out ok without blowing stuff up.
Actually it gets quite addicting buying from places like New Egg where you save good money,then there is that anticipation of waiting for the stuff to arrive,then installing and enjoying a revamped computer,the money saved and the tinkering inside the box has been really satisfying.
Again many thanks to you all for recommending and pointing the way for me. I just hope I can return the favor and help someone else that was in my shoes. The next time its time to upgrade it won't be so confusing,I'll look into probably building my own PC. Its not really hard,just abit intimidating,but once you jump in its quite enjoyable.
Thanks everyone.