You’d be surprised what you can do with a video editor that costs less than Final Cut Pro’s $300 entry fee. Screenflow is a professional grade screencasting production tool.
Extraordinary independent film guy, Caleb Wojcik, has a great walkthrough of Screenflow itself for those getting started.
I’ve produced videos for clients when they needed a walkthrough of their websites or products to fully understand them. Screenflow is also great for producing video tutorials and promo videos, but you could use it for all your video editing needs and people would think you had slaved over your projects in After Effects.