With stock suspension, if the goal is to keep it balanced and smooth through a turn. I would have to go with understeer, from what I've seen on a road track.
I've changed springs now, but it still favors undesteer......until I corded the front 275s, so ended up with a square set up, fresh 315 hoorsier r on the front and 5 year old nt01 315 on the back.....it was great, fastest times so far and it oversteered consistantly, but I liked it.
So really it is a preference.
If you want to try a little more oversteer, VBP has a 26 mm bar for the back.
Or this adjustable rear bar, which is my next experiment.
http://cartechstuff.blogspot.com/201...sway-bars.html