Alisa: my feeling is that $1,000 is a bit too high for line editing, & far too low for substantive editing. If you need the latter, get a real editor or a book coach; if the former, turn on all of Word's correction features & give some thought to each gaffe it thinks it finds, & then hand it off to someone to read for stuff like homonyms -- you can often get great comments for the cost of a good dinner, so call it $50 at the outside.