When is your next scheduled computer upgrade? Not to flame, but to keep up with what's "NEW" in software....you have to keep up with what's "NEW" in hardware.
However...their are plenty of things to chose from, but what SIMS have you played...so we can eliminate all the obvious? And how "SLOW" is your computer?
Their are alot of great games out there...and CFS or IL-2 may be the right direction, but not if you prefer flying the aircraft in LOMAC. Strike FIghters is a great game with plenty of mods as well...and works well on slower computer too.
I don't fly much any more...I stick with the ground pounder games...and more of them seem to be introducing AIRCRAFT...like BF1942/BFV, Soldner, and many more.
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Fates