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I quite like Pathfinder but I've not played many games of it. Whilst I like a lot of what they've done, it also loses out to wider 3.5 in terms of options. Core-wise, it has an excellent SRD which covers more than what's truly "Core", in fact.

In terms of running PF over here, well other systems are run in the other PbP groups and I don't think anyone minds; certainly with PF it's closely enough related to 3.5 that I can't see it would be any worse for the D&D community than Core 3.5 (which requires buying no books). I'm not sure setting up a PF CoCo would be a viable idea atm, though.