For "Value", pipe clamps are a good way to go, but in particular, the newer styles that have "feet" to allow you easier glue-up of panels on a flat surface. Irwin and Rockler both have configurations like this...I don't know if others do. You'll want some "F" clamps, too, in various sizes as well as a few spring clamps for quickie work. I keep 4 small "Quick Clamp" type available for jigging and other tasks where I need to clamp something one-handed.
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The most expensive tool is the one you buy "cheaply" and often...