David,
As one who has a passion for design and designs interior architecture professionally, I struggle to have positive feelings for pre-made project plans. On one level I like them for non-designers because the designs are usually not too horrible. But, from this designer's perspective, they're also usually uninspired. Vanilla, is the apt description (a favorite flavor of many [wink]). I took a peek at the suggested plansnow.com site and see that they have a few not-so-terrible vanilla plans somewhat suggestive of the Arts and Crafts style, which is popular among many woodworkers. But for those who, like me, are mainly interested in sleekly-proportioned modern aesthetics, such sources are dissatisfying.
With the limitations of pre-made plans in view, I have an alternative idea for you. Research great furniture designs online or printed design publications, and recreate/draw them in Sketchup (modifying the overall dimensions to suit your needs). What if Festool offered the Domino for free; wouldn't that be cool? Well, Sketchup is a powerful tool for woodworking and it is free! IMO, it's just crazy for woodworkers not to use Sketchup unless they're already using an equal or more powerful 3D modeling tool. To add to the free-tool coolness of Sketchup, Google provides free video tutorials from beginner to advanced, and there's even a free cut-list plugin for Sketchup that you can find with a simple search over in another woodworking forum (rhymes with Slumber Socks). If you haven't already started learning Sketchup, you would be wise to you dive into it. With it you can generate all your own plans that fit your own needs and design sensibilities exactly.