Marathon vs. Half...a Dilemma

So...I have completed five marathons. But the last few I've run I couldn't help but think how nice it would be to already be done when I passed that 13.1 line. My fastest marathon time was a disappointing 4:05 in the 2011 Ogden Marathon. So after completing that one I was determined to beat 4 hours! I kept training all summer and in the fall I ran the St. George Marathon. I kept a good pace for the first 15 miles and was on track to meet my goal, when achilles trouble started. I ended up walking most of the last ten miles and finished with a time of 5:35. After that I had to go to physical therapy to be able to run again. I decided that I was done with marathons  and all of last year I just ran halfs. So much more fun! Your long runs really are never more than 12 miles, a great distance. However...now that I am getting more into running again, I am considering running a marathon. On Friday I ran 14 miles. I was ready to be done at 12 miles, but I pushed it and completed all 14. It wasn't fast, but I ran almost the whole time - and there was a lot of uphill! (an equal amount of down though, since it was out and back). It was a good run, I felt great after...so now I am considering the Top of Utah marathon in September. But do I want to commit to 15-22 mile runs....? I've got one month to make up my mind so we'll see what happens!