I have a 6" 686+ that I have been very happy with. I used it for USPSA matches for a while before getting a 610 to take advantage of moonclip loading.
I used HKS speedloaders which worked fine but are a bit fragile due to the necessarily thin walls between chambers. Once they began cracking, the rounds wouldn't always fall freely into the cylinder. In their defense, this was after much hard use.
The 5star speedloaders kinggabby linked to look very nice. I'll have to check them out.