Well, re the filters. Hoya are an optics company with a long and illustrious reputation. They now own Pentax. Hoya also have a large (I think majority) stake in the lens maker Tokina and supply Tokina with all their glass. Tokina owns Kenko, and Hoya filters are made by Tokina/Kenko. C'est le vie. I use Hoya filters and have never had any problems with them. I'd probably steer clear of some name you've never heard of though.
I've no experience with 3rd part grips at all, but I have heard that none of them have weatherproofing where the OEM grip has, and they sometimes lack some of the buttons found on the originals (certainly for Pentax anyway). Doesn't mean they don't work, just that they're limited in functionality.
Regards, Gary
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