I AM STILL PAYING ON MY 2004 330 XI THAT I BOUGHT USED. IT IS IN EXCELLENT CONDITION IN AND OUT.?

I SAW THE M3 AND AM THINKING ABOUT LEASING THE M3 IN DECEMBER AS A PRESENT TO MYSELF. DON'T GET ME WRONG, I REALLY LOVE MY PRESENT CAR. WOULD IT BE A GOOD IDEA TO LEASE SINCE I STILL OWE ON THE 330?