NVidia Geforce 210 1GB DDR3; ATI Radeon HD 5450 1GB; NVidia GeForce GT520 1GB... I'd like to know which one would be best for MS FSX. I don't want any suggestions for other products please, just help me decide between these three
The GT520 is the best out of the three.
The HD 6450 is a bit better than the GT520 though. Also, if you can go for a GT520, you must be in the $50 range.
Here's a HD 6570 for $50. http://www.newegg.com/Product/Product.aspx?Item=N82E16814102934
It's basically a re-badged HD 5670 and it'll be enough to run FSX.
As a bonus I'd like to know whether 2GB of RAM is enough... whether I should use 64bit or 32bit... and finally, should I use WINXP or WIN7?
2GB is okay, but 4GB is the minimum that you'd want, if using Win7.
You should use a 64 bit OS if you've got more than 3gigs or RAM, and 32 bit if RAM is lower than 3gigs.
Well, using either Win7 or WinXP is according to you really.