How long is a piece of string !!
tough question to answer , you can do a lot with stock suspension , adapt a ;ot of parts to make it better or spend a lot of cash replacing everything .
There are a lot of topics in the suspension area on upgrades , I would start by searching there , narrow down a direction you want to go in & A budget that fits .
Tires are approx 50% of the handling gain so 14 " are not helping you at all , if you like the look moving to 17 or 18" will significantly change handing alone .
I am going to move this to the suspension area where it will get more views .