I'm a gaming/flight simming fan but am a complete PC dummy and haven't a clue about PC specs, so I simply waltz into my local computer shop and tell them- "Build me a PC capable of handling all the latest super-duper high-end games and sims" and leave it to them.
My current PC that they built for me cost £1700 (2356 USD) and it runs everything smooth as silk and I can help companies develop their games under my gaming name 'PoorOldSpike' and also write articles and tutorials for gaming forums..
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PS- Here are the current Steam games and sims I own, plus I've got more that are non-Steam-