What crate engines is everyone using??

local machine shops rock.

most of them would be glad to take a crate engine and balance/blueprint for you.
the cost would be well worth it imo. they would spot any problems and you would be good to go.

if you want to just buy something to bolt in, then use one of the builders here that people give kudos to. if you go out on ebay and buy a crate and just want to bolt it in and drive, good luck.