+1 to what yuhhaur posted. some of the upgrades are just not worth it.

you can consider going for those super high end ones if your gear has already reach max limitation (can't find replacement from AH) and you really are desperate in maxing out the possible stats AND most of all, having the funds to spare.

For the rest of us, who don't have many millions - just go with gear purchase.

Now my gear also not many sockets. Have socket also not much gems to put because all upgraded to that 80,000 gold type. my Ruby and Topaz all ends at flawless square because I'm not willing to spend on it those that I don't use.

my star are all emerald and amethyst. crit + dex + vit only.