Best 3 series for ride comfort? Also is the 320i enough?

[lornemalvo]

I'm thinking about a nearly new 3 series touring. Which model is best for ride comfort (which I value more than ultimate sportiness). Everything seems to be an M Sport,

Also, do owners find the 320i to be adequate in terms of performance? I've discounted the plug in hybrid because it leaves a tiny boot. I've also read about someone who had a VERY expensive nightmare with the gearbox (plus almost no-one would work on a hybrid outside main dealer network)