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Actually I'd try
http://www.chessworld.net. It cost like $24 a year, but it's a server where you play games with 2,5,7 or more days
per move. For learning it's great because you can take the time and really look at your position since you usually have a few days to make a move.
If you want an invite send me a PM.
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ICC has correspondence games as well. if you're going to pay online, you might as well do it on the best server available, which is the ICC. it literally has every option available, it's only downside being poor bughouse support