I see no harm in getting a refurbished apple. Apple has great warranties and their tech. support has always been better than any PC maker. Definitely get the apple, besides the refurbished one will save you a few bucks.
Desktop: Dell Dimension E510, 2.5GB RAM, Intel P4 3.0GHZ, 250GB HDD, Windows Vista Premium. Might not be the best, but the old girl is still running good.