28 Days Later. The first alternate ending is better, but the movie was still great (picture quality was awful on Blu-Ray though -- I think it might have looked better if we had just gotten the DVD and let the PS3 upscale it, but then again it was low-budget and the entire thing was filmed on digital video cameras so what can you do?). 90
Immediately followed by 28 Weeks Later. Stayed true to the original, but was higher budget and much more Hollywoodish. Still liked it, but the original is better. 85