Andy - I'm with CC - you don't want the pasta extruder attachment!!!
want the meat grinder attachment, and the sausage stuffer attchment for it if you want to make sausages, if you don't own any other attachment.
The slicer/shredder attachment is great if you're looking to do a bunch of slicing/shredding in no time at all - you can do more in one batch than in a food processor ... you're only limited by the size bowl you put down to catch the food. It's really no harder to clean than a hand grater, I find it easier than my food processor - but Oh MY GOSH - is it FAST!!!!!
Ragarding the pasta extruder attachment, that goes on the meat grinder, you probably don't want it because you have to use such a soft dough. Of course, you don't know that until you get it and read the recipes/instructions. I've had mine for 3 years and NEVER used it.
I've got the pasta roller/cutter 3-pc set (about $100 from Cooking.com) - it works just great but wish I had gone with an Imperia SP-150 (think that is the model number I bought my kids) hand cranked pasta machine (about $40). For about the same price (with the optional motor) it can do soooo much more than the KA set. With the KA you can only cut fettuccine and linguine ... with the Imperia you have a choice of 10 different cutters ($15 each) and the ravioli attachment is only $30! KA wants $125 for their Ravioli attachment.
Before someone jumps in with their war stories of trying to use an Imperia and how much better the Atlas is ... they are basically identical. Just like the KA roller/cutter attachment ... you have to have your dough right or you will have problems. My daughter has an Atlas, my sons have Imperia, and I've got my KA - I've never had a problem with any of them once I figured out the dough consistency.
For Pasta machines - check out http://www.pastamakers.us
The KA Fruit & Vegetable Strainer was also a BIG dissapointment. Another waste of money - I'm back to using a strainer and a spoon to make applesauce and apple butter.