If you do decide on a Prohunter make sure you go for the latest version which has a black stock, the earlier models had a grey stock. Around three years ago they upgraded the stocks due to flexibility in the forend. The new stocks are fibreglass reinforced and very good.
The most famous Steyr rifle is the SSG, this was the sniper rifle of choice in the West for many years and has a fantastic reputation. They now look a little dated and cost approx 25% more than the Prohunter but this is a definite shooter. I believe they are guaranteed sub 0.5" but most shoot 0.25".