Unless youve got a lot of time on your hands I wouldn't reccommend video editing on your system.
Whilst you may think that going for a DVD burner rather than a CD burner may be 'future proof' - I would advise you to think what you are going to use it for. If you are not going to get much use out of it until you upgrade your system, and are not planning to do that for a year or so I would advise to just go the CD route. DVD burners are coming down in price every day and are getting faster/better - when you finally decide that you really need a DVD burner you will then be able to get exactly the right machine for the job.
You can always put video onto CD's (VCD option) - you just don't get much on each one.