PB,
Loreto is a fantastic spot to fish, all species of fish there from Dorado, Rooster Fish, Yellowtail, Yellow Fin and all on th Sea of Cortez so for the most part fairly flat water.
Spent a couple days there on our drive home in December, amazing fishing community
As for guides and operators, will depend on what your looking to target and you budget.
The above mentioned is a fantastic operation, targeting big Tuna, again depending on budget you might want to contact them and see if you can hop on with another group to keep cost down.
If your looking for a more economical trip these guys are great, they have great gear, solid boats and their local guides know the area well and get you on fish. I have not fished with them personally but have lots of friends that drive south from Cabo to fish with them quite often. Met the owner last time I was in town, great guy, been in the area forever.
http://toursloreto.com/
Have a great trip, lol forward to details on the fishing
Cheers
