Teri - As I said on a previous post, i've done the move and job change WAY too many times!!! LOL If this is something that you want, a job/company you like and a location you can learn to enjoy/love then GO FOR IT!!! If you leave Lily in good stead, with a sufficient resignation timeline then WORSE case you can always go back, IF you decide down the line you don't like Nashville!!
You only live ONCE, I say, take the $$, take the job, move-fish-live and ENJOY the change!!!!
Oh, and I swore i'd NEVER live in the Chicagoland area, I then out of college 3 months moved to Schaumburg, and loved the job and made a SLEW of $$ in the process. Got engaged and moved 18 months later but the experience in the job laid the groundwork for the next few jobs I got and the salary increases as well.
Trep