I purchased the Cleaveland tool package just over a year ago for my RV-7 build. Can't comment on RV-14 specifics but I'm happy to comment on the Cleaveland package in general, there are a few things I'd do differently.
Firstly though, I'd like to say you've made a good choice. I spent way too long putting together a spreadsheet to compare various suppliers- the result? They all provide basically the same value, and all require additions and substitutions. So I went to Cleaveland because they had certain must-have tools for me, namely the hand squeezer and dimple dies. Possibly could have saved a few bucks by shopping around more but tools are not really the place to save pennies.
So, just going down the list from top to bottom-
Lightweight air hose kit- excellent, but consider the deluxe kit with 3 hoses and manifold block. It won't be long before you end up with another pneumatic tool or two, for me it was a cleco gun, so I've ended up with another hose and a manifold.
Tungsten Bucking bar- when I got my tools the older steel bars were still included but I chose to delete them. Mistake! I ended up buying the palm size and footed bars. The Tungsten is great but its small size can make it difficult for an inexperienced bucker to hold square against the rivet. We got a lot of slanted shop heads on the VS before trying the wider steel bar and it worked better. The tungsten bar is worth its weight in tight spaces but I think the traditional bars are still worth having.
Back riveting plate- consider the longer one. Its a common error to run out of back riveting plate when riveting rudder stiffeners- don't ask how I know!
ABSOLUTELY!!
Countersink cutter- I got 3 flutes and have had no problems using them in my cordless electric drill.
Common wisdom says lots more 3/32nd clecos! A -14 builder will be better placed to say just how many.
Countersink cage- I've been happy with this one, works just fine. As many have said you'll end up with more than one, so this one should be great to get started and become your second cage if you ever find a better one.
Dimple dies- In the context of all the other tools these are actually cheap, so consider getting the whole set including tank, substructure and the small diameter female.
24" ruler- fine but I also ended up with a 6 inch version and use it daily, much more convenient.
Main squeeze- I saved a $100 and bought the almost identical but rarely mentioned Geezer squeezer. Same design, heavier (read cheaper) materials. It has been absolutely fine, not too heavy at all. I have been comfortable with the decision to defer buying a pneumatic squeezer. This hand squeezer is very easy to use.
3 inch yoke- add a longeron yoke at least. Absolute lifesaver. Many get the 4 inch no hole yoke but that is more of a personal choice based on willingness to use pop rivets in tight spots.
What would I add? I got a rivet cutter. Sure Vans say you can use a seemingly short rivet when they call it out, and I'm sure the pros can successfully squeeze a slightly too long rivet. But for 40 bucks having near perfect size rivets every time has made life so much easier for this inexperienced riveter. you'll also need some longer rivets from vans, the cutter cannot trim a half size off a rivet, it needs to cut a longer one.
Bought the rivet removal tool. Won't get into some tight spots and is only for universal head rivets, but makes drilling the heads off bad 1/8 rivets very quick and easy. A cupped cage centres the bit and then limits the drilling depth so you just get the head off. Again, a great one for the inexperienced!
Pneumatic cleco gun. Search carpal tunnel on these forums.
Sure there's more but can't think of any right now. I feel that most of us probably do our tool purchases the wrong way around. Saving money in the beginning, but adding tools that slowly make life easier as we get more experienced. But the time when we most need those tools that make life easier is right at the beginning when we have no experience!
Good luck with your decisions!
Ed