A note of caution. One of my friend got the Giottos ballhead (can't remember the model no.), and the retaining screw in the plate worked itself loose after some time, while he was carrying his setup over his shoulder (300D + BGE1 + 70-200 f4L + 550EX), the whole thing came crashing down to the ground. Luckily it was sandy ground and not concrete, the flash hot shoe took the brunt of the impact (broke) and he had to send his 300D back to Canon Service Centre to get it fixed (cost abt $50 for the replacement parts).
After this incident, I would not recommend Giottos ballhead, instead the Manfrotto 486RC2 is a better bet. The plate mount has a safety catch that prevents you from accidentally releasing the plate via the plate release lever. Can support 300D + BGE1 + 70-200 f4L + 550EX or its equivalent with no problems.