Buying speakers without hearing them is difficult, but sometimes you have to. Is there any place you could go listen to some? Where are you located? Plug your location into Klipsch, etc websites and see/call places around you to go have a listen. With a budget of $1,000ish for a 2.0 setup, I personally think you can do A LOT better than Polk Tsi or the lower/smaller side of Klipsch's Ref. line.
Are you set on floorstanders? For that budget you wont find a floorstander that is a true full range speaker (especially for a large room). You might be better off selling the F12, buying a nice set of bookshelves and looking into a better sub.
Panny 65st60 / Denon X1000 / EMP e55ti / EMP e56ci / EMP e5bi / (2) e1010i