[Miss Marple]

LOL! I got a Cuisinart from the Chef's Catalogue. It is SUPER for slicing things, although if you can't leave it set up all the time it would be pretty cumbersome to move around just for slicing tomatoes.

I used it to make a really good ham salad after Christmas, sliced lemons for drinks and garnishes, chopped nuts in large batches for cookies, and some other stuff I can't remember. I use it 3-4 times a week.

What I chiefly need the mixer for is making cookie dough. Stiff cookie dough is sort of hard for me to manage and a Kitchenaid with dough hooks looks to me to be the solution.

[Pukin Dog]

Ha HA. My Kitchenaid Beast cuts through stiff cookie dough like buttah! So glad I dumped the girlfriend and kept the mixer! I am even contemplating the Alton Brown flames for the thing. I leave it on the counter, cause it impresses the ladies....

[Phsstpok]

I wouldn't use a food processor to slice tomatoes.  It's too likely to make tomato soup out of it.  I'd use a mandoline, instead:

 

So long as you use the knuckle protector it's just as safe as a food processor, it's easy to set up and store and it makes great slices (or juliens, etc.).  This one is by OXO and sells for around $70.  OXO is the brand of kitchen gadget's the Alton Brown uses a lot on Food Network. 

The big thing I'm coveting now is the Cuisinart Griddler.  It's like a George Forman grill, but also works well as a panini press and, unlike the Foreman ones, it can open out flat and be used as an indoor flat grill.  It also has flat plates to swap for the grill plates and can do things like pancakes.  It's about $130.