Most of the tripods mentioned here are overkill for a light 4x5 - most people end up getting a dedicated tripod for 8x10 and a lighter version for 4x5.
I use a RRS ball head and legs for 4x5. It works very well if you read the instructions and use the ball head with enough drag to give yourself subtle control.
For 8x10, it depends on the camera design but the large, low-profile Gitzo 1504 3-way head with the large platform is great for flatbeds. The Ries, Sinar, and Linhof two-axis heads are also very nice and sturdy without being too heavy.
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