I have a Moots Vamoots and a couple of high end aluminum bikes. At 105psi with a Fizik Pave saddle and similar wheels - they all ride the same. Does the fact that they're high end frames guarantee that they will ride better than your allez - who knows. You might find they're not worth the newly spent 5 grand.

Buy any high end bike in any material because you're looking for an excellent ride.

Buy a ti bike because you like the way they look.