Voted for Centrafuse. To be honest I've been following the development for some years now and like that it's a solid product with a good GPS solution built-in. Plugins are simple to implement (I've done one myself) although the interface could do with being expanded a bit (this is being worked on). Skinning seems simple enough but some are talking about improving it further. The devs have been a bit quiet recently but this is due to an upcoming release.
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I would also like to add that, in my honest opinion, most of the commercial products are junk.
I love completely unfounded statements like that. It does make me chuckle. Some products are junk and others are not. Whether they are commercial or not is irrelevant.