They really should make the harvester config for no "sounds" a default given that it is mostly more of a problem for servers rather than single player (where they can change it easier).
On topic, I really like how force engines don't explode. I also like that they have a definite path for upgrading efficiency by progressing through a number of mods (aqueous accumulator for water, mfr rancher on cows for milk, bees for crushed ice) and can use pretty much any liquid fuel you want to throw at it.
I tend to like liquid fuels for the simple expedient of being able to send power through a liquid tesseract without loss. This lets me plan my bases more spread out without burning resources on stuff to get stuff from point A to point B, never mind the technical problems of sending stuff that way across a number of (potentially unloaded) chunks. Liquids also store nicely (even aesthetically if one is using the amazing OpenBlocks mod) and many of them can also be used for EU production if left in liquid form until needed.
As for making massive amounts of MJ, that really depends on having massive amounts of resource gathering or renewable resource creation going on; then having a large enough processing array to handle it all and enough storage for overflow when demand for fuel is relatively low (or a way to shut the entire thing down). MFR has thus far proven great for this, handling vast tracks of land with a huge variety of resources. All the blocks involved can be connected to a rednet and flicked off with a single lever. But even if you never turn it off, MFR also has a way of producing renewable quartz (laser drill) for the inevitable AE system to deal with the overflow.
On boilers, I like how much power they produce and they're great in a server setting. But for my purposes, I've lately been using mostly force engines and biofuel generators. They're just easier to set up at remote outposts (which I tend to make because it's just easier to deal with bees in their preferred habitats prior to getting the ridiculous levels of power needed for extra bee machines, never mind the bee-related barriers of entry).