Good for you for choosing a healthier you! Some wonderful advice here (TE forum rocks!) and I agree with saving your $1000 for a better bike later and making do for now. I rode my BF's handmedown Trek 2300 for months before committing to my own bike and although I had to pay with plastic I have not regretted it for a minute! You are going to need some clothing too so keep that in mind. This is not an inexpensive passion but the rewards are priceless!