How do you know what your weakest link is?


I'm  contemplating what to upgrade and need some advice on what my weakest link is? I'm considering either upgrading my Clearaudio Concept Wood to a Performance DC Wood/Ovation with a Hana ML or upgrading my Musical Surroundings Nova III to a Modwright 9.0. Is my table the weak link or is my phono? What will my best gain come from and what should I expect that gain to manifest as? 
128x128j-wall
If you think your system consists entirely of these few components, that is your weakest link.
Thanks for your thoughtful contribution to the betterment of hifi and audigon. 
Both matter ( of course ) but when in doubt I always lean towards turntable upgrades ( vs cart or phono ). I know some will disagree but the table sets the fundamental quality level imho...
As to which is weaker in your system I cannot say.