I don't really have anything to add, these guys have you covered but I wanted to remind you that the diameter of the wheel needs to be as close to the stock wheel as possible.
If it's smaller your FF will feel too strong, larger and it'll feel too weak. In this instance the power of leverage is NOT your friend. 
To go along with that, I ended up with a 280mm wheel.
Primarily because when using a 320mm wheel, my knuckles were hitting the shifter housing on the Sega Model 2 control panel.
But yeah, it would also change both the feel of the ffb and the speed at which you can change direction.
I think the SF Rush wheels were a little larger than most arcade games, but it's been so long since I played on a real machine that I'm not sure.
Last time I checked there was only one affordable 280mm wheel on ebay.
There are a lot of nice ones that aren't affordable.
