Hooray for progress!

After trying to burn CDs on iTunes for the last 30 minutes and having my computer crash on me three separate times, I decided it was finally time to set up the external hard drive to move the 4 years of pictures I have on my computer onto a huge terabyte drive.  I hope that stops the crashing problem.  I know it's time to get a new computer but I'm trying to hold out until January if I can.  And I don't know if I should get a Mac or another Dell (which I loved).  I know Mac people are seriously biased.  If you've had both a Mac and something else, tell me your recommendation...