In this case I'd recommend the KJW. It'll do what you want, it's inexpensive, and as said before, the mags will work with a TM if you decide to build something real fancy later on. It just hits all the marks for dollars-to-doughnuts.
The KSC/ KWAs are sweet, you won't be making a bad choice if you buy one, but I'm all about practical and penny pinching. Any time you can share mags between guns is a good time, so that wins it for me personally. Too bad my hands don't like Glocks.