Like the others said, this is a great place for support. I'm just starting back after losing 96 lbs in 10 months and gaining back 79 in the following 13 months.
I'm 5'11" and am looking to get in the 180 range as my ultimate goal as well so we're in the same position! I'm slightly heavier than you though and slightly shorter so you have less to lose.
I hope to see you here alot. Posting (successes and things that aren't so successful) really keeps you going. It's nice to know that others are in the same position and that you can always find someone that really understands here, to help you along the way.
Take care and best of luck!