The best gun for mainly target shooting is real steel since I doubt that you have PAL so airgun would be your best choice for target shooting. It's cheap and practically easy to get than airsoft plus more durable for its price.
Those three brand that you mention above are somehow ok and would need some tune up to be field able.
Get AV and looking for decent gun is not hard. The budget around 400 to 500 $ would get a decent gun like G&G full metal or sometime CA also or probably ICS as well.