No worries on the variable ratio steering. Its really only two ratios, one for general driving and another for tight turns when steering angle exceeds 100-deg. Vehicle speed has nothing to do with it. I was a little worried when I first tried it but its very easy to get used to and is helpful in tight quarters or in hairpin turns. The transition from one ratio to the other is fairly seamless, at least it felt that way to me. The DHP will do exactly what you hope for.
My wife didn't care about navigation. She did insist on sunroof and seat heaters. She also wanted the day-night mirror and garage door buttons both of which became standard equipment on the 2013 model.
MY2013 328i, N26 / 300 / 4CG / KCDF / 2DW / 205 / ZDH / 302 / 3DZ / 403 / 494