I've bought from Trade Winds a few times and I've always been satisfied with the results. Pretty high germination rates and they've always grown true. Yes, some of their things are overpriced, but hey, I just don't bother with those varieties. I decided after the fact to do a few more varieties this year, so I have Pequin and the Orange Scotch Bonnets out of curiousity... I'll probably start germinating them this weekend, along with some basils later in the year.
Also bought Yerba Mate seeds for the fun of it, but since the germination rate on them is absolute crap anyway those won't be any judge of their quality. Still, since they tend to have limited viability to begin with, if any of them pop up for me you'll definitely see me singing praises here.