Joe:
If you want the easiest path on maintenance and replacement parts, I'd suggest Cuisinart, specifically the DLC-7 or DFP-14 machines. The DLC-7 was introduced in the early '80s, and the current DFP-14 is essentially the same machine with some detail changes, now made in China instead of Japan as the DLC-7 was.
The DLC-7 is readily available used on eBay, and the DFP-14 is available new. Parts for one fit the other, so used parts from eBay can be a good budget-conscious choice. You should know that there have been changes over the years to the feed tube and pusher system, so if you're looking to replace any of those parts, care should be taken to get an exact match to whatever you have.
I personally think it's always prudent to get a large-capacity machine. As I used to say when I was in the thick of the food processor wars in the '80s, "You can always do less in a big machine, but you can't do more in a small one." The difference in footprint and cubic storage requirement is small, but the difference in usability can be huge.