Marrt, These prices are from the end of last year, but should give you an idea. All three NH dealers, that I talked to were within $50 of each other.
TC21D with FEL, and 60" MMM- $16,200
TC18 with Hydro, PS, FEL, and 60" MMM- $14700
Not sure about difference for Rear Discharge?
The FEL is about a $3000 option. Also I know they came out with incentives, so you can knock some off those prices. I bought a used TC21D with 92hrs on it (FEL & MMM) for $13,500. I couldn't be happier with it. Good Luck, I hope this helped. Kent