MFR tree farms for steam dynamos are good, I usually start with a variation there-of. Right now though, I'm running off a biofuel reactor with 3 biofuel generators. I started with the standard saplings and potatoes and carrots and seeds but now I'm automating the production of dyes by feeding wool into pulverizers (25% drop of the dye of the color of the wool), then putting the string into a cyclic assembler to make wool, then the wool into more cyclic assemblers to make colored wool. You dye 8 wool with one dye, yielding ~1 extra dye per cycle of this, and the MJ cost is relatively cheap. Get 9 dyes going like this and you have yourself a fully efficient biofuel source that's less laggy than an MFR tree farm, especially if you use transfer nodes.
