Based on the ones I've seen that is a reasonable price.  Some may not agree with that but if it's brand new or rebuilt by them I would think it's worth that price and in line with what usually pops up on eBay and those on eBay are more often used than not.

I think the Water Valve you need is 4171000 and many on eBay but let's wait and see if someone can validate that as I don't have a cross reference sheet to compare the old numbers with the new ones.  Geneally you'll pay in the $25 range for one of these.

These are two very easy fixes.  Good luck.  That's a great machine.

Steve (and others too), do you have an opinion on whether to use a dual or single inlet valve?  I think some time ago there was a debate on here on whether to use single or dual inlet valves.  I have been converting mine to single because I thought the general consensus was the single was better.  Or now that I research it more is it because they just quit making the dual for some reason?

Jeff, I think this single valve will work on your machine but these other guys are the experts I am not.  I would see how they weigh in.

As far as my own personal opinion on new or used I will generally go for the new if the difference in dollars is that low.  If the difference is bigger like $50+ dollars I will consider the used one.  I guess with parts this old you never know and any of them are a gamble.   The other criteria I use to make this choice is will I be using the machine occasionally or as my daily driver.  If daily driver I'll usually go for the new part if I can swing it.

For $2.75 through PayPal, the downloaded version of the service manual in AE will have everything you need, and will save Steve from having to scan the whole manual. 

Kudo's to you for keeping a classic going.  I've been using a KDS-17 as a daily driver for years now.  I'm quite happy with it.  It doesn't hurt to keep an eye out for them on Craigslist, as having extra parts on hand will help it live for years to come.

Ben

I have that exact issue in my house.  The former owners tiled up to the front of the dishwasher and not underneath.  To make matters worse they tiled over a Formica countertop that hangs over and restricts from the top.

Luckily I was able to turn the feet all the way down and wedge it out which isn't easy because the KDS17 has a metal frame all the way around it and we had to inch it in and out (thanks Mike and Todd).  I think around the 20 series or so the metal frame only came up the sides about 1/2 way.  Those aren't as difficult to get in and out but still is a pain with all that adjusting of the back feet from the front when the machine is installed.  Not on the top of my hit parade of favorite things to do!

My KDS15 won't fit at all because it is about 1/8" too tall even with the feet all the way up.  I thought about taking them off all together but once the dishwasher gets back into the cabinet it drops about an inch or so because of the floor.  Without the leveling feet I wouldn't be able to raise it up and I'd have a huge gap at the top.

Bottom line, for a few extra dollars life will be much easier down the road if you go under all your cabinets and appliances.  Have you seen the new porcelain tile that looks like wood grain that Steve mentioned above?  It's a pretty good alternative.  Hardwood looks great in the kitchen but over time you may wish you did something else especially if your kitchen is a very active one.

Personally if it were me I would go with the new.  If the difference was over about $50 I would consider the used one but given you want to use it as a daily driver and the cost difference is relatively low, I would go with the new.