I killed 3 KitchenAids making bread. A 5-qt model jumped off a counter, a 6-qt professional model burned up its motor and dripped black powder into everything it mixed (replaced under warranty) and the gears stripped on the replacement 6-qt pro model. 2 years ago I got the Electrolux Assistent (now sold as the Verona.) I LOVE LOVE LOVE it. It was a little cheaper a couple years ago, but I'd probably still get it today. If you check the bread making forums (thefreshloaf.com, etc.) there are a LOT of people who have problems with the kitchenaids for making bread. I always followed the instructions and kept it below the maximum capacity of the machine, and only ran it for a few minutes (yes, no more than 3 or 4) at a time as recommended when making dough, and it still tore itself to pieces. My Electrolux has more capacity, is MUCH quieter, and is easier to move around. I can set the timer for it to knead bread and walk away--I don't have to worry about it taking a leap off the counter, and I can run it for as long as I like. Cooks Illustrated gave it a bad review, but I don't think they read the instructions before using it. There are also a lot of videos on line--the bottom line is put your liquids in first, then as you add your flour, etc, if the dough starts moving up the roller, adjust the roller so there's more space between the roller and the edge of the bowl. With the KA I was making double batches of dough and it died. With the Electrolux I make triple batches, and the machine doesn't break a sweat. I also like the open bowl so that you can add ingredients without fighting the spinning hook.
I generally only make bread with it, but it comes with a plastic bowl with beaters that I've used once for making a cake--it worked just fine. I don't like the plastic bowl as much because it has a tower in the midde (kind of like a bundt pan) with the drive shaft for the beaters and you don't have that nice open bowl to work with. Next time I make something like that I'll probably just try the regular bowl and roller and see how it works--some people have said that the big bowl is too large for small batches. I've used both roller and hook to make bread, and they both work well. The hook is nice for big batches of heavy dough.
I've also heard very good things about the Bosch. But if you're looking to make a lot of bread, the KitchenAid may not be your best bet. Cuisinart and Viking stand mixers have a lot of followers, but they have a lot of negative reviews, too. I know King Arthur Flour used to use Viking mixers in their test kitchens and sell them online, and now they only sell Cuisinart, fwiw.