If you really want/need the machine you will keep it. I am sure that you would not buy it just to brag to your mates down the pub that you jave the fastest, biggest, coolest, sturdiest, quietest machine in teh world. Just because it is slightly faster or slightly slower than the latest uber-geek computer, will not be noticeable by nere mortals and should not be of concern to any normal person.
I assume that you are running some fairly hefty video-editing programmes of MGM proportions to justufy buying this computer as that is all the computer is needed for. If so, then using the programme is much better than worrying if the machine is a bit faster then the bloke next door's.