You can measure frame geometry and visually inspect it, but the only way to measure stiffness, road feel, etc, is to build it up and ride it. After a few rides, you'll know if it's right for you. Fit is key. I'm currently riding a new, but cheap aluminum frame, and besides being a bit harsh on rougher patches of asphalt, it's great because it fits me. That's the most important thing. You can mess around with stem length and seat fore/aft positions only so much. Build it up and give it a ride. Gino