I only have a KA too, but I have all the attachments you mentioned. The dough hook came with it but the mincer and pasta attachments were extra (read a lot extra).

I'm pretty sure it's Limeslice, but someone here swears by the Kenwood. I remember them posting that it has a more powerful motor.

My mum has a Kenwood and since they're roughly the same price for the machine I would have gotten one, but the KA looks so much nicer and TBH nothing I do really requires a more powerful motor than the KA. I think when I looked the Kenwood attachments were roughly the same price as the KA.

I didn't even look at the Sunbeam. I have their basic model and the exxie one was no-where near as powerful as the other two.