Not sure if you can find them in your neck of the woods but I just bought lupine collar and leash from http://www.lupinepet.com/ altho I got mine off ebay.
The leash is 6 feet long.

I have a retractable leash that I only use for taking Keegan out on my property for potty breaks. I've had it since I had my greyhound so for at least 7 years b/c Keegan will be 6. I bought if for my greyhound b/c it was the only 'freedom' she had. But when this one breaks - I won't be replacing it. It has definately gotten its money's worth.
I can definately see the retractable having a purpose for responsible pet owners like you. But I think people should be given a test before getting one. TOOOOOO many people stand around and don't pay attention and allow the dog to roam all however many feet of leash. And think that b/c they are on leash they are ok. I watched this @ a recent doggie event and turned to one of my friends and said yup that is why not everyone should have a retractable leash.