Hi all,
I stop ride bike since last ~5 years ago, I would to ride bike again for exercise and tour, I hope can get a bike no more than $700 for my start, I am interesting to ride road bike, aluminium frame, with Shimano component, and my frame size is 60cm.

What is the best bike I can get? And where can I buy it in the United State ON-LINE (I live out side US, and in my country there is one or two shops with limited features)

Regards,
dxb