for best of both worlds... better to have "one rig for its intended application"... joke3x... hehehe... pero, naa'y uban peeps na mo himo ani... i'm one... dili lang gud mga mahalon na components... pwede ra man share ang monitor pud for the desktops... ayayayay...
and yes, for mobility, go for the notebook...
TS, need ka ug decision analysis ani gyud... in real world, you can't get both as you've mentioned in just one rig... you shall sacrifice your other "wants"... pili-a kun asa ang mas preferred nimo gyud...