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www.neteller.com
www.firepay.com
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I think, though I am not sure since it has been a while since I deposited money, the cost of depositing to neteller is considerably higher than firepay. (Though maybe they have multiple options and I just saw the one.)
A lot of people seem to think neteller is more reputable. I have not had problems with either, though I now use neteller almost exclusively since that seems to be a more readily available withdraw option.
Also, if you know you want to deposit at a specific site, look for bonuses that are tied to specific deposit mechanisms. For instance, UB ran a firepay deposit bonus recently. I am not sure if it was stackable with the initial deposit bonus or not, so the point may be moot.