I think something like www.myasics.com could be a good idea for you. You input information like how far can you currently run, when is your race, what is your goal time (if you have one) and it'll develop a running plan for you to get you ready for your race. There are options of how many weekly runs you want to do, I think 2-4 a week.

I am currently using the Zen Labs Couch210K app, it's like C25K but continues to build you up to 10k. It's five weeks from the end of the 5k part until it gets you up to 10k. Seeing as you can already run 5 miles I think this might be a bit too basic for you, but perhaps if you could do 3 runs a week you could follow weeks 13 and 14. If you are interested they are:

Week 13 Day 1: (Run 22 min, walk 1 min) x2
Week 13 Day 2: (Run 25 min, walk 1 min) x2
Week 13 Day 3: (Run 30 min, walk 1 min) x2
Week 14 Days 1-3: Run 60 min

Once you've got the 60 minutes running sorted then keep adding a bit more every week until you are at 10k.