half again?

So, I was talking with my friend Matt today, and he asked if I was going to run the Lewis & Clark half marathon in September. L&C is the other major half marathon in St. Louis - in fact, its where Dean Karnazes' 50, 50, 50 started last year. I hadn't really thought about whether I would do it or not until Matt's question. And now, I don't know:

Pros:
- I want to run another half marathon someday
- Its convenient (I don't have to travel)
- Matt will probably run it too (and in under 2 hours)
- Being in training makes me feel good about myself (physically and mentally)
- It would keep me on a workout schedule
- I've already written the daily mileage in my day planner

Cons:
- I hate running in heat
- I like sleeping in on weekends
- I've been looking forward to having weekends for long bike rides, float trips, weddings, rock climbing, and relaxing by the pool
- I was so bored with running by the time I finished training for the St. Louis half that I just started running regularly again last week
- I hate running in heat
- I like running in the cold (even sub 30 degree weather with snow on the ground)
- I've already missed the first week of training (not that big a deal, training for the week calls for 13 total miles, and I was gonna run 10 or so anyway)
- Training would mess with my current agreement with a workout partner who would not be training

After this analysis, I think I am just gonna keep doing what I'm doing and not train. If what I'm doing ends up looking like training, then maybe I'll sign up for the race. Otherwise, I think I will enjoy long bike rides, float trips, weddings, rock climbing, and relaxing by the pool (while still getting in 5 or more workouts a week). I think I am more suited for spring racing rather than fall racing because of my very strong training weather preference. What do you all think?