I am a beginner cyclist (I actually haven't yet begun) and I need some advice on finding the right bike for me. I am a female 5'10", 150 lbs. I've been spinning for the last year and I am ready to get out on the roads but I don't know what type of bike I should get and how much I should spend. I would eventually like to commute to work which is only about 15 miles each way but don't want to spend too much until I know that this is for me. Please give me some advice on a road bike with the best value for someone in my situation. Thank you!