Looks like a great machine. However, if your main uses are as you state downloading and dvd burning, the machine is far more powerful (and therefore expensive) than you need.
IF you are likely to want to do anything more demanding later, ie video editing, gaming, then great. If not, i would suggest a lower spec machine at a cheaper price.(although you haven't mentioned the cost in your post)
Will you be wanting to use the machine for anything else in the future?
hope this helps,