Yes! You totally should do a marathon :) Miss, speedy on the half! My PR is 1:53... down from 2:08! I'd love to get under 1:50.
I'm so close to signing up for one! it's slightly intimidating but I think I'm ready for it! and awesome PR!! I was only shooting for a sub-2 hour half on mine but it was the PERFECT race day so I decided to just leave it all out there. It's always a great feeling when you hit a huge PR! :)