I voted $200k+ based on what I have seen around me (USA/Canada).
There is a difference between rich and living a good lifestyle, in my opinion that is. I feel that living a good lifestyle is what meets your own standars (the house you envision, the car you drive, the luxuries you purchase that make you happy within a constraint amount of cash).
However, being rich is when you can afford big houses in the most expensive areas of wherever you live (usually a decent house costs upward of $1million in urban areas), you can buy any car you wish (high-end...whatever you consider), can purchase clothes/accesories without worrying about paying off other bills, etc. I am very privilaged to have come from a "rich" family and having just about everything I wanted bought for me (I am not trying to brag or anything, its just how I grew up), but gaining working experience and learning how much luxuries costs really helps one appreciate hard-earned $$$.
I am a univeristy student and my expenses are already crazy (just necesities/year):
-$10,000 tuition
-$550/month for apartment with 2 friends ~ $6,500
-$150 cable, internet, cell phone, utilities ~ $1,800
-$1000 textbooks
-$150/month for gas or coming home to visit ~ $1,800
-$250-300/month for food ~ $3,000
so thats already $24,000 without shopping, going out, etc. I guess I am a kid and that is the largest expense for a family, but just showing ballparks of how living alone can be seen.
With that being said $100-200k can lead you a good life, but being considered "rich" will take a lot more. But also once again, depends on your definition of rich (income) plus health, family, love, etc.
Please don't bash, just my opinion.
Cheers