super splitters
I have 4 super splitters, one is a year old, the other 3 are from 20 to 26 years old... I do over 1000 cords yearly, and I've owned about every type of splitter available. I had a timberwolf TW7 (which is the "packaged" wood splitter), and I had the built-rite 16-way "packaged" wood splitter. The timberwolf was just over $10,000 and the builtrite rite at $14,000. The supersplitters are under $4000. I've sold everything but my supersplitters. Take it from someone who knows; if you are looking to do high-production firewood, super-splitters are THE ONLY way to go.
Of course this is short of a processor, if you can get the wood split the right size a processor would be great.
Don't let people fool you though, you will not split very gnarly wood with these machines. we only cut/buy straight grained wood. We package all of our wood, so we have to have straight pieces to make pretty packages. I do keep an old hydraulic splitter around for huge pieces or the off chance that we get some gnarly stuff. If we have pieces that are over 16-18" in diameter (also depending on wood type) I'll normally halve or quarter them (I do it with a splitting hammer, but my employees normally use the hydro splitter) and then 'finish-split' them with the SS.
I can go on and on about wood splitters, but to make a long story short, buy a super-splitter... You will be happy, even with units priced 3-4times higher, nothing can compete.