I would (strongly) add on to Magnum and kramer's endorsement of Steel Beasts Pro. For now, it is $100. Or you could think of it as just a little more than $99.99
You mentioned that you are an avid flight simmer. SBP is essentially the armor sim world's Falcon 4. Simply the finest ever made. And it, like BMS and Free Falcon in the F4 world, keeps getting new features and updates but unlike Falcon or Jane's or most (all?) of the classic sims, it is the developer that keeps improving SBP.
The cost - Skyrim costs about $60. Lots of new, premium games and sims cost around $50. The current price for SBP is equivalent roughly to two A level new game releases, maybe three if you are lucky or find a sale. Before you make up your mind and reject this superb sim after seeing the price the first time, consider that it will live on your hard drive more or less forever. It isn't a play once, twice, maybe play for a month or two and then let it fade away. Like the best flight sims, you will find its huge and growing stock of missions, its many different fully player capable armor fighting vehicles (M-1 Leopards, Challenger, M-72, and many others) engaging you more and more as time goes by. Multiplayer is a blast - solid as a rock. After a year or two, many other games will have come and gone on your drive, and only the truly great ones keep you engaged. How much value and TSS (time spent simming!!) do you really get from the dollars spent?
From that perspective, which ones are actually expensive? Which ones have the best cost/benefit ratio?
PS If you do buy SBP and end up not wanting it after a while, there is a pretty avid market in re-selling it at a high percentage of the original price - unlike used games.