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Browndog are you seriously suggesting that a flash gun will be sufficient for taking shots of rugby players? I can tell the OP it most certainly won't work, and you really will be wasting your money trying it.
As for bike shots it all depends on how far away you are, to stop action you really need at least 1/250 sec. Sometimes flash might be useful but most times it just isn't going to have the power unless your within a few feet, you can of course use a group of muliple flash heads, but then you run into costs similar to the big lenses.
On the old site there was a regular who photographed amateur football who used the 120 - 300mm f/2.8 Sigma, you might be able to get away with the 70 - 200mm if you can put up with losing all the long end of the lens, and a 1.4 TC will get you to 280mm at f/4.
Speedotron is about the only product on the market for illuminating spots arenas and they normally are pre installed and photographers pay to use them with pocket wizzard triggers, I wasn't suggesting you buy one, but it does give an indication of the power needed to get enough light for stop action photography. No amount of stobist technique is going to help illuminate a rugby pitch and if you did buy an extra powerful flash head I don't think the players would appreciate it much.
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