Hopefully our resident statician Luthor1 will see this thread and post his thoughts/stats... Generally think it's reasonable to say that weight (specifically) isn't so much of an issue - a more ideal target would be combination of weight and body fat ratio (owing to all that muscle being heavier than fat stuff).
Looking at a Body Mass Index (BMI) chart would be a reasonable starting point to understand a healthy weight for your height. I've been running for 3 years now and I'm still only just within the 'normal weight' category... bordering on overweight

though I know plenty of people my weight who look a darn sight unhealthier!
