would like to hear your opinions on the stock replacement. which brands. did you notice any accuracy improvement?
Short action or long action? The short actions (depending on cal) can have an accuracy improvement if the bolt stop is replaced with a long action stop and long action magazines used. More research will be required (such as your s.a. case diameter will work with long action mags). This works wonders if you reload.
Changing the trigger guard to a metal one helps too.
You can also stiffen the poly stocks with devcon 10110. There are lots of guides on the net for this.
Bedding can be done as well, but is time consuming and tricky for the first timer.
Outside of this you can go chassis (adds weight) or a cf stock from the us, or a boyds. Bedding is required to wring out the most accuracy if you go this route .
With a long action tikka...well either the metal trigger guard, new chassis/stock, bedding/stiffening the poly stock or different bullet based on bearing surface lengrh will be your best bet.
Outside of all of this is a rebarrel for a different twist with a different stock (boyds/cf for hunting or chassis for target shooting).
So you can throw money at it, or flip the tikka on the EE and use the funds for something else. Just depends how far you want to go.