Someone said :
Superb choice there Super, i'm mainly interested in flight simulation, had one on an old computer that took ages to load and was just frustrating, like some good old "Shoot 'em up's" too,bang bang stuff mind, not junkies injecting heroin.
PC all the way then me aul mate.
Upgrade the current one to gaming spec, grab a second hand flight stick on the free ads and you are sorted.
Mouse and keyboard is the best way to play shoot em ups, so you are half way there.
Simple controller you'll get for about a tenner 2nd hand. http://www.adverts.ie/gaming-controllers/phantom-2-flight-sim-con etc ...
A more expensive option. http://www.adverts.ie/gaming-controllers/ch-products-fighterstick etc ...
Here's World of Warplanes
, just like World of Tanks and World of Warships, it's completely free.
If you want to get all retro? You can emulate any old console on a PC for free and play every game ever made (again... for free).
No programming knowledge needed, just download the emulator, download the games on the same site and bobs your uncle. I use a wireless xbox 360 controller to play all the old console games.