Here's a good start.
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Now. Are you looking for a reclinable bucket, or fixed bucket? Reclinables will (most of the time) require a bottom mount seat bracket. This is not the same as the brackets for your stock seats and will need to be purchased. Fixed buckets will use both bottom mount and side mount seat brackets. These can be found at Bride USA, and I would purchase from them as they are the most reputable.
Good seats include Bride, Sparco, and Recaro. Some can debate that NRG make good seats as well. My personal favorite is Bride. While people claim that a knock-off bucket can be just as good as a genuine seat, you must keep in mind that in a serious collision, the real seat will withstand the shock of the impact much better than the China-made knock off, so that is also a factor to keep in mind.