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I've been riding some (originally second hand) shimano rs10 wheels on a CX bike for well over a year and been very rough with them, and am amazed with how well they have held up. That said the front wheel is pretty flexy and I don't think it helps my cornering confidence in any way whatsoever, so try and get something with a slightly higher spoke count if possible.
Tubs are the best choice if your racing a lot especially if your local courses have many places in which you are likely to pinch flat.
so I'm a total cx noob. Do I need cx specific wheels or will a tough ish set of road wheels be ok? I've read tubs are good but I guess I will start on clinchers? Is it better to run a wider rim? Many questions!