claber metal reel from gardiners if your using a cold system.around £40.had mine 2 years.still going strong.100 m of thermobore fits nicely.
We use these:http://www.brodexbms.co.uk/products/hose-accessories/van-mounted-steel-hose-reel-no-hoseMore expensive than most but it runs on bearings and is far more solid than anything else we have tried.
We've changed over to thesehttp://www.redashe.co.uk/Reelworks%20208%20hand%20cranked%20reels.html