This is the way my thinking is going as well but even though I've been riding off and on since 1995, I've never really delved into the technicalities of frame geometry & materials, a subject that I now find fascinating.

For most the time I've been riding, I've been on a higher level Trek Multitrack. Other than being True Temper cro-moly, I know little about the tubing but I suspect it's pretty stout. I've never felt any flex in the frame but I generally stay seated at all times. I've come to the conclusion that the frame is a little on the small side (53.5cm and I'm 6' tall) and my only major complaint is the high trail, which I've addressed with a cheapo, skinny after-market fork. If I continue to ride on a regular basis, it will be worth it to me to get a better fitting frame with the geometry I want. I've spent more on custom swords and firearms than I would for a custom frame so I'm hoping to eventually go that route.