in symbian apps are made using qt,go to nokia developers.com,you will get full support,assistance,tools for developing app,may be an n9 handset also if nokia liked your app.
considering your needs nokia 500 is the best phone,it has best screen,best battery,best internet(class 33 edge),best built and call quality.second best option is Lg L3 based on specs but i dont know about its reliabiliy.give galaxy y and pocket a miss it has poor battery backup,poor screen and...
no if that was possible everybody should have bought nokia,you need to buy apps from ovi store most apps are free also hd games are quiet cheap compared to android market.