I've finally settle down and decided these are the factors I want in my racket, can someone think on top of their head which racket fits the criteria? (crap i think I might own one like that, the AT300) haha. Ok, any other racket besides the At300.
How about Yonex Nanospeed 9000 S? Guess it fulfills criteria of being light, stiff (you can also opt for extra-stiff version) and medium balance.
I'd say the APACS Tantrum 200 might fit the bill. It's not extremely light at almost 4U but is stiff and medium balance (to me).
The sotx woven 5a is a nice racket that seems to fit your description. i've played with it for a few weeks and i think it's very well balanced in terms of performance. If you want something faster and more powerful with the same specs, Victor Arterytec Ti-99 4U would fit the bill.
all the yonex ns series from 5k until 9.9k all fit that description to a degree, with slightly varying balance points (6k, 7k, and 8k veer towards head light.