I agree with much of the advice given so far. The 940 has a built-in antenna tuner where the others most likely do not so that may push that radio a bit higher on your list. It was also Kenwood's top-of-the-line at the time and has more features than the others that may be useful (or may just make it more complex, depending on your take on things). The 940 is the ancestor of the current 990 so the model line is still in production, although many changes have been made along the line.
The 520 (because of the tube final) can be tuned to a much wider range of antenna loads than the solid state radios will go (the 940's built in tuner will help on that model, but an automatic tuner like its built-in one has a more limited range than a tube type radio will handle) so there's a plus to help counter the negative of it being a tube type radio. That said, you'll need to retune the radio (peak this, dip that, etc.) when you change frequency a large amount or especially when you change bands. The 5x0 series is no longer being produced and replaced by the 4x0 line. This may lower the radio's value, although it's popular with collectors, depending on condition.
The 430 is (was) a good basic radio and has a pretty good feature set without making the radio too complex for beginners (that might make it simple now, but not enough radio for you later). It is still part of the Kenwood lineup, but not directly. It is the ancestor of the current 480 so the line is still active, although many changes have been made as you might expect.
The 130 was a basic entry model and designed with fairly few features, but enough for the beginning ham to get started without being confused by more features that make operation a bit more complex. It will make a good starter radio, but you'll probably need more radio sooner rather than later. The 130 line is no longer being produced and was replaced by the 4x0 line of radios. This may cause the value to be limited.
That breakdown will hopefully help you figure out which you may want from your selection. One thing I do suggest is that you have it (or have them all, especially if they are going to be sold) checked out professionally. They're all pretty old radios and many have capacitors that fail with age. There also may be issues that only show up under certain conditions (certain bands, when cold, when hot, when certain options are selected, etc.). With a professional checking the radio out and certifying its condition (or repairing it to work as certified), you can sell for more (or have a good argument for the set price) than "I turned it on and everything appears to work".
One recommendation for this service is
Ham Radio Repair | HamRepair.com | Professional Amateur Radio Repair that charges $45 for an evaluation and that amount is applied to the repair if needed and you have them repair it for you. (Note, this amount is from their web site and you should check to verify prior to doing anything.) You will also need to properly pack the radio and pay to ship it to them. Please note that they have stated that drop-off service is not available so shipping is required even if you live in the area. If you're interested in using them, their web site has both a phone and e-mail available so you can contact them to discuss what you would like them to do for you. They often can get parts from "parts radios" to help repair broken ones even when Kenwood doesn't have replacements available.
