I don't know how big a room you are talking about, but in my case in a room of 12' x 12' I am able to clearly record the spoken voices (at normal level) in the opposite corner w/o use of extended mic.
Check if Sony's ICD-UX533 or SONY ICD-PX533 meets your requirement. Available in Sony showrooms at a price range of 5800 to 6500/-
There are also good Olympus ones available but then they are too expensive. The ones I checked were above 10K.